├── Basics
    ├── 1.c
    ├── 10.c
    ├── 11.c
    ├── 12.c
    ├── 13.c
    ├── 14.c
    ├── 15.c
    ├── 16.c
    ├── 17.c
    ├── 18.c
    ├── 19.c
    ├── 2.c
    ├── 20.c
    ├── 21.c
    ├── 22.c
    ├── 23.c
    ├── 24.c
    ├── 25.c
    ├── 26.c
    ├── 27.c
    ├── 28.c
    ├── 29.c
    ├── 3.c
    ├── 30.c
    ├── 31.c
    ├── 32.c
    ├── 33.c
    ├── 4.c
    ├── 5.c
    ├── 6.c
    ├── 7.c
    ├── 8.c
    └── 9.c
├── Hard
    ├── 75.c
    ├── 76.c
    ├── 77.c
    ├── 78.c
    ├── 79.c
    ├── 80.c
    ├── 81.c
    ├── 82.c
    ├── 83.c
    ├── 85.c
    ├── 86.c
    ├── 87.c
    ├── 88.c
    ├── 89.c
    ├── 90.c
    ├── 91.c
    ├── 92.c
    ├── 93.c
    ├── 94.c
    ├── 95.c
    ├── 96.c
    ├── 97.c
    └── a.out
├── LICENSE
├── Moderate
    ├── 34.c
    ├── 35.c
    ├── 36.c
    ├── 37.c
    ├── 38.c
    ├── 39.c
    ├── 40.c
    ├── 41.c
    ├── 42.c
    ├── 43.c
    ├── 44.c
    ├── 45(Pending).c
    ├── 46(Pending).c
    ├── 47.c
    ├── 48.c
    ├── 49.c
    ├── 50.c
    ├── 51.c
    ├── 52.c
    ├── 53.c
    ├── 54.c
    ├── 55(Pending).c
    ├── 56.c
    ├── 57.c
    ├── 58(Pending).c
    ├── 59.c
    ├── 60_pending.c
    ├── 61.c
    ├── 62.c
    ├── 63.c
    ├── 64.c
    ├── 65.c
    ├── 66.c
    ├── 67.c
    ├── 68.c
    ├── 69.c
    ├── 70.c
    ├── 71.c
    ├── 72.c
    ├── 73.c
    ├── 74.c
    └── a.out
└── README.md


/Basics/1.c:
--------------------------------------------------------------------------------
1 | //Program to print "Hello World"
2 | #include<stdio.h>
3 | int main()
4 | {
5 | 	printf("Hello World");
6 | }
7 | 


--------------------------------------------------------------------------------
/Basics/10.c:
--------------------------------------------------------------------------------
 1 | //Program to check whether the number is even or add
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n;
 6 | 	printf("Enter the number\t");
 7 | 	scanf("%d",&n);
 8 | 	if(n%2==0)
 9 | 	{
10 | 		printf("The Number is Even\t");	
11 | 	}
12 | 	else
13 | 		printf("The Number is Odd\t");
14 | }
15 | 


--------------------------------------------------------------------------------
/Basics/11.c:
--------------------------------------------------------------------------------
 1 | //Program to accept three numbers from user and print them in ascending and descending order
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int a,b,c;
 6 | 	printf("Enter three numbers\t");
 7 | 	scanf("%d\n%d\n%d",&a,&b,&c);
 8 | 	if(a>=b && a>=c)
 9 | 	{
10 | 		if(b>=c)
11 | 		{
12 | 			printf("Descending order\t%d\t%d\t%d",a,b,c);
13 | 			printf("\nAscending order\t%d\t%d\t%d",c,b,a);	
14 | 		}
15 | 		else
16 | 		{
17 | 			printf("Descending order \t%d\t%d\t%d",a,c,b);
18 | 			printf("\nAscending order\t%d\t%d\t%d",b,c,a);	
19 | 		}	
20 | 	}
21 | 	else if(b>=a && b>=c)
22 | 	{
23 | 		if(a>=c)
24 | 		{
25 | 			printf("Descending order\t%d\t%d\t%d",b,a,c);	
26 | 			printf("\nAscending order\t%d\t%d\t%d",c,a,b);	
27 | 		}
28 | 		else
29 | 		{
30 | 			printf("Descending order\t%d\t%d\t%d",b,c,a);	
31 | 			printf("\nAscending order\t%d\t%d\t%d",a,c,b);			
32 | 		}	
33 | 	}
34 | 	else
35 | 	{
36 | 		if(b>=a)
37 | 		{
38 | 			printf("Descending order\t%d\t%d\t%d",c,b,a);	
39 | 			printf("Ascending order\t%d\t%d\t%d",a,b,c);	
40 | 		}
41 | 		else
42 | 		{
43 | 			printf("Descending order\t%d\t%d\t%d",c,a,b);	
44 | 			printf("Ascending order\t%d\t%d\t%d",b,a,c);			
45 | 		}	
46 | 	}
47 | }
48 | 


--------------------------------------------------------------------------------
/Basics/12.c:
--------------------------------------------------------------------------------
 1 | //Program to find the roots of a quardratic equation.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int a,b,c;
 6 | 	float r1,r2,det;
 7 | 	printf("Enter the cofficients of a,b,c\t");
 8 | 	scanf("%d\n%d\n%d",&a,&b,&c);
 9 | 	det=(b*b)-(4*a*c);
10 | 	if(det>0)
11 | 	{
12 | 		r1=(-b+(sqrt(det)))/(2*a);
13 | 		r2=(-b-(sqrt(det)))/(2*a);
14 | 		printf("Roots are %f and %f",r1,r2);
15 | 	}
16 | 	else
17 | 	{
18 | 		r1=r2=-b/(2*a);	
19 | 		printf("Roots are %f and %f",r1,r2);
20 | 	}
21 | }
22 | 


--------------------------------------------------------------------------------
/Basics/13.c:
--------------------------------------------------------------------------------
 1 | //Program to accept rollnumber and marks of three subjects from user and print total marks, average and grade.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int rollno,total=0,i;
 6 | 	int *marks;
 7 | 	float avg;
 8 | 	char grade;
 9 | 	marks=(int *)malloc(3*sizeof(int));
10 | 	printf("Enter the roll number\t");
11 | 	scanf("%d",&rollno);
12 | 	printf("Enter the Marks of three subjects\n");
13 | 	for(i=0;i<3;i++)
14 | 	{
15 | 		scanf("%d",&marks[i]);
16 | 		total+=marks[i];
17 | 	}
18 | 	avg=total/3;
19 | 	if(avg>90)
20 | 	{
21 | 		grade='O';	
22 | 	}
23 | 	else if(avg>80)
24 | 	{
25 | 		grade='A';	
26 | 	}
27 | 	else if(avg>70)
28 | 	{
29 | 		grade='B';	
30 | 	}
31 | 	else if(avg>50)
32 | 	{
33 | 		grade='c';	
34 | 	}
35 | 	else
36 | 	{
37 | 		grade='D';	
38 | 	}
39 | 
40 | 	printf("\nReg No.\tTotal\tAverage\tGrade\n%d\t%d\t%.2f\t%c",rollno,total,avg,grade);
41 | 	free(marks);
42 | }
43 | 


--------------------------------------------------------------------------------
/Basics/14.c:
--------------------------------------------------------------------------------
 1 | //Program to print numbers from 1 to n using while loop.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,i=1;
 6 | 	printf("Enter the value of N\t");
 7 | 	scanf("%d",&n);
 8 | 	while(i<=n)
 9 | 	{
10 | 		printf("%d\n",i);
11 | 		i++;
12 | 	}
13 | }
14 | 


--------------------------------------------------------------------------------
/Basics/15.c:
--------------------------------------------------------------------------------
 1 | //Program to print numbers from n to 1 using Do While loop.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,i=1;
 6 | 	printf("Enter the value of N\t");
 7 | 	scanf("%d",&n);
 8 | 	do{
 9 | 		printf("%d\n",i);
10 | 		i++;	
11 | 	}while(i<=n);	
12 | }
13 | 


--------------------------------------------------------------------------------
/Basics/16.c:
--------------------------------------------------------------------------------
 1 | //Program to print first n even numbers.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n;
 6 | 	int i=2;
 7 | 	printf("Enter the value of N\t");
 8 | 	scanf("%d",&n);
 9 | 	printf("The First %d even numbers are\n",n);
10 | 	while(i<=(2*n))
11 | 	{
12 | 		printf("%d\n",i);
13 | 		i=i+2;
14 | 	}
15 | }
16 | 


--------------------------------------------------------------------------------
/Basics/17.c:
--------------------------------------------------------------------------------
 1 | //Program to accept a number and print that number in reverse order.
 2 | //Ex:- 1024
 3 | //Output:- 4201
 4 | #include<stdio.h>
 5 | int main()
 6 | {
 7 | 	int n;
 8 | 	printf("Enter the number\t");
 9 | 	scanf("%d",&n);
10 | 	while(n>0)
11 | 	{
12 | 		printf("%d",n%10);
13 | 		n/=10;	
14 | 	}
15 | }
16 | 


--------------------------------------------------------------------------------
/Basics/18.c:
--------------------------------------------------------------------------------
 1 | // Program to accept a number and print sum of it’s digits
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,total=0,rem;
 6 | 	printf("Enter the number\t");
 7 | 	scanf("%d",&n);
 8 | 	while(n>0)
 9 | 	{	
10 | 		rem=n%10;
11 | 		total+=rem;
12 | 		n/=10;	
13 | 	}
14 | 	printf("The Sum of the digits are %d",total);
15 | }
16 | 


--------------------------------------------------------------------------------
/Basics/19.c:
--------------------------------------------------------------------------------
 1 | //Program to take a number from user and check whether it is Armstrong number or not.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,temp,rem,total=0;
 6 | 	printf("Enter the number\t");
 7 | 	scanf("%d",&n);
 8 | 	temp=n;
 9 | 	while(n>0)
10 | 	{
11 | 		rem=n%10;
12 | 		total+=(rem*rem*rem);
13 | 		n/=10;	
14 | 	}
15 | 	(total==temp)?printf("Armstrong Number\n"):printf("Not an Armstrong Number\n");
16 | }
17 | 
18 | 


--------------------------------------------------------------------------------
/Basics/2.c:
--------------------------------------------------------------------------------
1 | //Program to assign values of two numbers and print their addition
2 | #include<stdio.h>
3 | int main()
4 | {
5 | 	int a=5,b=10;
6 | 	printf("%d",a+b);
7 | }
8 | 
9 | 


--------------------------------------------------------------------------------
/Basics/20.c:
--------------------------------------------------------------------------------
 1 | //Program to take number from user and print table of that number.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,i;
 6 | 	printf("Enter the table number\t");
 7 | 	scanf("%d",&n);
 8 | 	for(i=1;i<=100;i++)
 9 | 	{
10 | 		printf("%d*%d=%d\n",i,n,i*n);	
11 | 	}
12 | }
13 | 
14 | 


--------------------------------------------------------------------------------
/Basics/21.c:
--------------------------------------------------------------------------------
 1 | //Program to accept number and print it's factorial.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,value=1,i;
 6 | 	printf("Enter the Value of N\t");
 7 | 	scanf("%d",&n);
 8 | 	for(i=n;i>0;i--)
 9 | 	{
10 | 		value*=i;	
11 | 	}
12 | 	printf("The Factorial of %d is %d",n,value);
13 | 	
14 | }
15 | 


--------------------------------------------------------------------------------
/Basics/22.c:
--------------------------------------------------------------------------------
 1 | // Program to accept number and print if it is prime number or not.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,i,flag=1;
 6 | 	printf("Enter the value of N\t");
 7 | 	scanf("%d",&n);
 8 | 	for(i=2;i<=n/2;i++)
 9 | 	{
10 | 		if(n%i==0)
11 | 		{
12 | 			flag=0;
13 | 			printf("\nNot a prime number");
14 | 			break;	
15 | 		}	
16 | 	}
17 | 	if(flag==1)
18 | 	{
19 | 		printf("\nPrime Number");	
20 | 	}
21 | }
22 | 


--------------------------------------------------------------------------------
/Basics/23.c:
--------------------------------------------------------------------------------
 1 | //Program to print 'n' prime numbers.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,i,j,flag=1,count=0;
 6 | 	printf("Enter the value of N\t");
 7 | 	scanf("%d",&n);
 8 | 	for(i=2;count!=n;i++)
 9 | 	{
10 | 		flag=1;
11 | 		for(j=2;j<=i/2;j++)
12 | 		{
13 | 			if(i%j==0)			
14 | 			{
15 | 				flag=0;
16 | 				break;
17 | 			}	
18 | 		}
19 | 		if(flag==1)
20 | 		{
21 | 			count++;
22 | 			printf("%d\n",i);	
23 | 		}	
24 | 	}
25 | }
26 | 


--------------------------------------------------------------------------------
/Basics/24.c:
--------------------------------------------------------------------------------
 1 | // Program to accept a number and print Fibonacci sequence.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,a=0,b=1,c,i;
 6 | 	printf("Enter the value of N\t");
 7 | 	scanf("%d",&n);
 8 | 	printf("0\n1\n");
 9 | 	for(i=2;i<n;i++)
10 | 	{
11 | 		c=b;
12 | 		b=a+b;
13 | 		a=c;
14 | 		printf("%d\n",b);		
15 | 	}
16 | 	
17 | }
18 | 


--------------------------------------------------------------------------------
/Basics/25.c:
--------------------------------------------------------------------------------
 1 | //Add 'n' numbers.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int i,n,temp,sum=0;
 6 | 	printf("Enter the value of N\t");
 7 | 	scanf("%d",&n);
 8 | 	for(i=0;i<n;i++)
 9 | 	{
10 | 		printf("\nEnter the number\t");
11 | 		scanf("%d",&temp);
12 | 		sum+=temp;		
13 | 	}
14 | 	printf("The total is %d",sum);
15 | }
16 | 


--------------------------------------------------------------------------------
/Basics/26.c:
--------------------------------------------------------------------------------
 1 | //Add 'n' numbers using array.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,i;
 6 | 	int total=0;
 7 | 	int *array;
 8 | 	printf("Enter the value of N\t");
 9 | 	scanf("%d",&n);
10 | 	array=(int *)malloc(n*sizeof(int));
11 | 	for(i=0;i<n;i++)
12 | 	{
13 | 		printf("Enter the value\t");
14 | 		scanf("%d",&array[i]);
15 | 		total+=array[i];	
16 | 	}
17 | 	printf("The Sum of %d number is \t%d",n,total);
18 | 	free(array);
19 | }
20 | 


--------------------------------------------------------------------------------
/Basics/27.c:
--------------------------------------------------------------------------------
 1 | //Program to accept a number and add the digits of that number.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,sum=0;
 6 | 	printf("Enter the Number\t");
 7 | 	scanf("%d",&n);
 8 | 	while(n>0)
 9 | 	{
10 | 		sum=sum+(n%10);
11 | 		n/=10;	
12 | 	}
13 | 	printf("The Sum of Digits of the Number is %d",sum);
14 | }
15 | 


--------------------------------------------------------------------------------
/Basics/28.c:
--------------------------------------------------------------------------------
 1 | // Program to accept a number and add the digits of that number using recursion.
 2 | #include<stdio.h>
 3 | int total(int n);
 4 | int main()
 5 | {
 6 | 	int n;
 7 | 	printf("Enter the value of N\t");
 8 | 	scanf("%d",&n);
 9 | 	printf("%d",total(n));
10 | }
11 | int total(int num)
12 | {
13 | 	static sum=0;
14 | 	if(num==0)
15 | 	{
16 | 		return 0;	
17 | 	}
18 | 	else
19 | 	{
20 | 		return num%10 + total(num/10);	
21 | 	}
22 | }
23 | 


--------------------------------------------------------------------------------
/Basics/29.c:
--------------------------------------------------------------------------------
 1 | //Average of numbers.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,i,temp;
 6 | 	float sum=0.0;
 7 | 	printf("Enter total Numbers\t");
 8 | 	scanf("%d",&n);
 9 | 	printf("Enter %d Numbers\n",n);
10 | 	for(i=0;i<n;i++)
11 | 	{
12 | 		scanf("%d",&temp);
13 | 		sum+=temp;	
14 | 	}
15 | 	printf("The Average of %d numbers are %.2f",n,sum/n);
16 | }
17 | 


--------------------------------------------------------------------------------
/Basics/3.c:
--------------------------------------------------------------------------------
 1 | //Program to accept values of two numbers and print their addition
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int a,b;
 6 | 	printf("Enter Two values\n");
 7 | 	scanf("%d\n%d",&a,&b);
 8 | 	printf("The sum is \t%d",a+b);
 9 | }
10 | 


--------------------------------------------------------------------------------
/Basics/30.c:
--------------------------------------------------------------------------------
 1 | //Program to calculate Square of 'n' numbers.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,i;
 6 | 	printf("Enter the value of N\t");
 7 | 	scanf("%d",&n);
 8 | 	printf("The First %d Square Numbers are\n",n);
 9 | 	for(i=1;i<=n;i++)
10 | 	{
11 | 		printf("\nThe Square of %d is %d",i,i*i);	
12 | 	}
13 | }
14 | 


--------------------------------------------------------------------------------
/Basics/31.c:
--------------------------------------------------------------------------------
 1 | //Program to take an alphabet from user and check whether it is a vowel or not.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	char a;
 6 | 	printf("Enter the Char\t");
 7 | 	scanf("%c",&a);
 8 | 	if(a=='A' || a=='a' || a=='E' || a=='e' || a=='I' || a=='i' || a=='O' || a=='o' || a=='U' || a=='u')
 9 | 	{
10 | 		printf("\n%c is a vowel",a);	
11 | 	}
12 | 	else
13 | 		printf("\n%c is not a vowel",a);
14 | }
15 | 


--------------------------------------------------------------------------------
/Basics/32.c:
--------------------------------------------------------------------------------
 1 | //Program to take two numbers and check whether they are amicable numbers or not.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int a,b,i,sum=0;
 6 | 	printf("Enter the two numbers\n");
 7 | 	scanf("%d\t%d",&a,&b);
 8 | 	for(i=1;i<a;i++)
 9 | 	{
10 | 		if(a%i==0)
11 | 		{
12 | 			sum+=i;	
13 | 		}	
14 | 	}
15 | 	if(sum==b)
16 | 	{
17 | 		sum=0;
18 | 		for(i=1;i<b;i++)
19 | 		{
20 | 			if(b%i==0)
21 | 			{
22 | 				sum+=i;	
23 | 			}	
24 | 		}
25 | 		if(sum==a)
26 | 			printf("Amicable Numbers\n");
27 | 		else
28 | 			printf("Not an Amicable Numbers\n");
29 | 	}
30 | 	else
31 | 	{
32 | 		printf("Not an Amicable Numbers\n");	
33 | 	}
34 | }
35 | 


--------------------------------------------------------------------------------
/Basics/33.c:
--------------------------------------------------------------------------------
 1 | //Program to accept a number and print the factors of that number
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int i,n;
 6 | 	printf("Enter the value of N\t");
 7 | 	scanf("%d",&n);
 8 | 	printf("The Factors are\n");
 9 | 	for(i=1;i<n;i++)
10 | 	{
11 | 		if(n%i==0)
12 | 		{
13 | 			printf("%d\n",i);	
14 | 		}	
15 | 	}	
16 | 	
17 | }
18 | 


--------------------------------------------------------------------------------
/Basics/4.c:
--------------------------------------------------------------------------------
 1 | //Program to print simple interest
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	float p,r;
 6 | 	int n;
 7 | 	printf("Enter the Principle value\t");
 8 | 	scanf("%f",&p);
 9 | 	printf("Enter No, of years\t");
10 | 	scanf("%d",&n);
11 | 	printf("Enter Rate of interest\t");
12 | 	scanf("%f",&r);
13 | 	printf("The Simple Interest\t%f",(p*n*r)/100);
14 | }
15 | 


--------------------------------------------------------------------------------
/Basics/5.c:
--------------------------------------------------------------------------------
 1 | //Program to accept value of radius and print area of a circle
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int r;
 6 | 	printf("Enter the radius of the circle\t");
 7 | 	scanf("%d",&r);
 8 | 	printf("The Area of a circle\t%f",(3.14*r*r));
 9 | }
10 | 


--------------------------------------------------------------------------------
/Basics/6.c:
--------------------------------------------------------------------------------
 1 | //Program to accept a number from user and print it's square & cube
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n;
 6 | 	printf("Enter the number\t");
 7 | 	scanf("%d",&n);
 8 | 	printf("The Square of %d is %d\nThe Cube of %d is %d\n",n,(n*n),n,(n*n*n));
 9 | }
10 | 


--------------------------------------------------------------------------------
/Basics/7.c:
--------------------------------------------------------------------------------
 1 | //Program to accept two values of a & b and swap their values
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int a,b,temp;
 6 | 	printf("Enter two number\n");
 7 | 	scanf("%d\n%d",&a,&b);
 8 | 	printf("The Value before swapped is %d\t%d\n",a,b);
 9 | 	temp=a;
10 | 	a=b;
11 | 	b=temp;
12 | 	printf("The Value after swapped is %d\t%d\n",a,b);
13 | }
14 | 


--------------------------------------------------------------------------------
/Basics/8.c:
--------------------------------------------------------------------------------
 1 | //Program to accept two number and print largest among them
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int a,b;
 6 | 	printf("Enter Two Numbers\n");
 7 | 	scanf("%d\n%d",&a,&b);
 8 | 	(a>b)?printf("The largest number is \t%d",a):printf("The largest number is \t%d",b);
 9 | }
10 | 


--------------------------------------------------------------------------------
/Basics/9.c:
--------------------------------------------------------------------------------
 1 | //Program to accept a number and check whether the number is positive, negative or zero
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n;
 6 | 	printf("Enter the Number\t");
 7 | 	scanf("%d",&n);
 8 | 	if(n>0)
 9 | 	{
10 | 		printf("The Number is positive\n");		
11 | 	}
12 | 	else if(n==0)
13 | 	{
14 | 		printf("The Number is zero\n");	
15 | 	}
16 | 	else
17 | 		printf("The Number is negative\n");
18 | 
19 | }
20 | 
21 | 


--------------------------------------------------------------------------------
/Hard/75.c:
--------------------------------------------------------------------------------
 1 | //Program to reverse the string
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	char string[100];
 6 | 	char *i,*k;
 7 | 	char temp;
 8 | 	printf("Enter the string\t");
 9 | 	gets(string);
10 | 	for(i=string,k=string + strlen(string)-1;k>i;++i,--k)
11 | 	{
12 | 		*i=*i^*k;
13 | 		*k=*k^*i;
14 | 		*i=*i^*k;
15 | 	}
16 | 	printf("\nThe reversed string is %s",string);
17 | 	
18 | 	
19 | }
20 | 


--------------------------------------------------------------------------------
/Hard/76.c:
--------------------------------------------------------------------------------
 1 | //Program to reverse the string using pointer
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	char string[100],*p;
 6 | 	int i;
 7 | 	printf("Enter the string\t");
 8 | 	gets(string);
 9 | 	p=string;
10 | 	for(i=0;i<strlen(string);i++)p++;
11 | 	printf("The Reversed string is \t");
12 | 	for(i=strlen(string);i>=0;i--)
13 | 		printf("%c",*p--);
14 | 
15 | 	
16 | 		
17 | 	
18 | }
19 | 


--------------------------------------------------------------------------------
/Hard/77.c:
--------------------------------------------------------------------------------
 1 | //Program to sort the strings
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	char string[20][20],temp[20];
 6 | 	int i,n,j;
 7 | 	printf("Enter no. of the string");
 8 | 	scanf("%d",&n);
 9 | 	for(i=0;i<n;i++)
10 | 		scanf("%s",string[i]);
11 | 	for(i=0;i<n;i++)
12 | 	{
13 | 		for(j=i+1;j<n;j++)
14 | 		{
15 | 			if(strcmp(string[i],string[j])>0)
16 | 			{
17 | 				strcpy(temp,string[i]);
18 | 				strcpy(string[i],string[j]);
19 | 				strcpy(string[j],temp);
20 | 			}		
21 | 		}
22 | 
23 | 	}
24 | 	for(i=0;i<n;i++)	
25 | 		printf("\nThe Sorted String is \t%s",string[i]);
26 | }
27 | 


--------------------------------------------------------------------------------
/Hard/78.c:
--------------------------------------------------------------------------------
 1 | //Program to swap two strings
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	char string1[20],string2[20];
 6 | 	char *temp;
 7 | 	printf("Enter the first string\t");
 8 | 	gets(string1);
 9 | 	printf("\nEnter the second string\t");
10 | 	gets(string2);
11 | 	if(strlen(string1)>strlen(string2))
12 | 		temp=(char*)malloc((strlen(string1)+1)*sizeof(char));
13 | 	else
14 | 		temp=(char*)malloc((strlen(string2)+1)*sizeof(char));
15 | 	printf("\nBefore Swapping\t%s and %s",string1,string2);
16 | 	strcpy(temp,string1);
17 | 	strcpy(string1,string2);
18 | 	strcpy(string2,temp);
19 | 	printf("\nAfter Swapping \t%s and %s",string1,string2);
20 | 	free(temp);		
21 | }
22 | 


--------------------------------------------------------------------------------
/Hard/79.c:
--------------------------------------------------------------------------------
 1 | //Program to add two matrix
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int first_matrix[50][100],second_matrix[50][100];
 6 | 	int rows,columns,i,j;
 7 | 	printf("Enter the rows and columns of first matrix\t");
 8 | 	scanf("%d\t%d",&rows,&columns);
 9 | 	printf("Enter the value for first matrix\n");
10 | 	for(i=0;i<rows;i++)
11 | 		for(j=0;j<columns;j++)
12 | 			scanf("%d",&first_matrix[i][j]);
13 | 	printf("Enter the value for second matrix\n");
14 | 	for(i=0;i<rows;i++)
15 | 		for(j=0;j<columns;j++)
16 | 			scanf("%d",&second_matrix[i][j]);
17 | 	printf("The Summation Matrix is \n");
18 | 	for(i=0;i<rows;i++)
19 | 	{
20 | 		for(j=0;j<columns;j++)
21 | 		{
22 | 			printf("%d\t",first_matrix[i][j]+second_matrix[i][j]);	
23 | 		}
24 | 		printf("\n");
25 | 	}
26 | }
27 | 


--------------------------------------------------------------------------------
/Hard/80.c:
--------------------------------------------------------------------------------
 1 | //Program to arrange array numbers in ascending order
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int *array;
 6 | 	int i,j,n,flag=1,temp;
 7 | 	printf("Enter the number of elements\t");
 8 | 	scanf("%d",&n);
 9 | 	array=(int *)malloc(n*sizeof(int));
10 | 	printf("Enter the elements\n");
11 | 	for(i=0;i<n;i++)
12 | 		scanf("%d",&array[i]);
13 | 	for(i=n-1;i>=0 && flag;i--)
14 | 	{
15 | 		flag=0;
16 | 		for(j=0;j<=i-1;j++)
17 | 		{
18 | 			if(array[j]>array[j+1])
19 | 			{
20 | 				temp=array[j];
21 | 				array[j]=array[j+1];
22 | 				array[j+1]=temp;
23 | 				flag=1;
24 | 			}
25 | 		}
26 | 	}
27 | 	printf("The Elements in Ascending order\n");
28 | 	for(i=0;i<n;i++)
29 | 		printf("%d\t",array[i]);
30 | 	free(array);
31 | }
32 | 


--------------------------------------------------------------------------------
/Hard/81.c:
--------------------------------------------------------------------------------
 1 | //Program to check whether the matrix is sparse matrix or not.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int array[10][10];
 6 | 	int m,n,count=0;
 7 | 	printf("Enter number of rows and columns\t");
 8 | 	scanf("%d\t%d",&m,&n);
 9 | 	printf("Enter the matrix values\n");
10 | 	for(i=0;i<m;i++)
11 | 	{
12 | 		for(j=0;j<n;j++)
13 | 		{
14 | 			scanf("%d",&array[i][j]);
15 | 			if(array[i][j]==0)
16 | 				count++;					
17 | 		}
18 | 	}
19 | 	(count>(m+n)/2)?printf("Sparse Matrix with %d zeros",count):printf("Not a Sparse matrix with %d non zeros",(m*n)-count);
20 | }
21 | 


--------------------------------------------------------------------------------
/Hard/82.c:
--------------------------------------------------------------------------------
 1 | //Program to delete given element from array
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int *array;
 6 | 	int i,j,n,element,flag=0;
 7 | 	printf("Enter the number of element\t");
 8 | 	scanf("%d",&n);
 9 | 	array=(int *)malloc(n*sizeof(int));
10 | 	for(i=0;i<n;i++)
11 | 	{
12 | 		scanf("%d",&array[i]);
13 | 	}
14 | 	printf("Enter the element you want to delete");
15 | 	scanf("%d",&element);
16 | 	for(i=0;i<n;i++)
17 | 	{
18 | 		if(array[i]==element)
19 | 		{
20 | 			for(j=i;j<n;j++)
21 | 			{
22 | 				array[j]=array[j+1];
23 | 			}
24 | 			//break;
25 | 			flag++;
26 | 		}
27 | 	}
28 | 	if(flag==0)
29 | 	{
30 | 		printf("Oops, The element is not found in the array");
31 | 	}
32 | 	else
33 | 	{
34 | 		for(i=0;i<n-flag;i++)
35 | 		{
36 | 			printf("%d",array[i]);
37 | 		}
38 | 	}
39 | 	free(array);
40 | 	return 0;
41 | }
42 | 


--------------------------------------------------------------------------------
/Hard/83.c:
--------------------------------------------------------------------------------
 1 | //Program to delete the number of elements in an array
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int *array;
 6 | 	int i,j,n,position;
 7 | 	printf("Enter the size of the element\t");
 8 | 	scanf("%d",&n);
 9 | 	array=(int *)malloc(n*sizeof(int));
10 | 	for(i=0;i<n;i++)
11 | 	{
12 | 		scanf("%d",&array[i]);
13 | 	}
14 | 	printf("Enter the position which you want to delete\t");
15 | 	scanf("%d",&position);
16 | 	if(position>(n+1))
17 | 	{
18 | 		printf("Please enter the valid position\t");
19 | 	}
20 | 	else
21 | 	{
22 | 		for(i=position-1;i<n;i++)
23 | 		{
24 | 			array[i]=-99;
25 | 		}
26 | 	}
27 | 	for(i=0;i<n-position;i++)
28 | 	{
29 | 		if(array[i]!=-99)
30 | 			printf("%d\n",array[i]);
31 | 	}
32 | 	free(array);
33 | }
34 | 


--------------------------------------------------------------------------------
/Hard/85.c:
--------------------------------------------------------------------------------
 1 | // Program to calculate the determinant of 3×3 matrix.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int i,j,determinant;
 6 | 	int array[3][3];
 7 | 	printf("Enter the element of the matrix\n");
 8 | 	for(i=0;i<3;i++)
 9 | 	{
10 | 		for(j=0;j<3;j++)
11 | 		{
12 | 			scanf("%d",&array[i][j]);
13 | 		}
14 | 	}
15 | 	determinant = (array[0][0] * ((array[1][1]*array[2][2])-(array[1][2]*array[2][1]))) - (array[1][0] * ((array[0][1]*array[2][2]) - (array[0][2]*array[2][1]))) + (array[2][0] * ((array[0][1]* array[1][2])- (array[1][1]*array[0][2])));
16 | 	printf("The Determinant value is %d",determinant);
17 | }
18 | 


--------------------------------------------------------------------------------
/Hard/86.c:
--------------------------------------------------------------------------------
 1 | //Program to find Largest and Smallest number in array
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int *array;
 6 | 	int i,max=0,min=999,n;
 7 | 	printf("Enter the number of elements in an array\t");
 8 | 	scanf("%d",&n);
 9 | 	array=(int *)malloc(n * sizeof(int));
10 | 	for(i=0;i<n;i++)
11 | 	{
12 | 		scanf("%d",&array[i]);
13 | 		if(array[i]>max)
14 | 			max=array[i];
15 | 		else if(array[i]<min)
16 | 			min=array[i];
17 | 	}
18 | 	free(array);
19 | 	printf("\nThe Largest and Smallest Number in the given array is \t%d\t%d",max,min);
20 | }
21 | 


--------------------------------------------------------------------------------
/Hard/87.c:
--------------------------------------------------------------------------------
 1 | //Program to reverse the array
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int *array;
 6 | 	int i,j,n;
 7 | 	printf("Enter the size of the array\t");
 8 | 	scanf("%d",&n);
 9 | 	array=(int *)malloc(n* sizeof(int));
10 | 	for(i=0;i<n;i++)
11 | 	{
12 | 		scanf("%d",&array[i]);	
13 | 	}
14 | 	for(i=0,j=n-1;i<n && j>=0;i++,j--)
15 | 	{
16 | 		if(i<j)
17 | 		{
18 | 		array[i]=array[i]^array[j];
19 | 		array[j]=array[i]^array[j];
20 | 		array[i]=array[i]^array[j];
21 | 		}	
22 | 		else
23 | 			break;
24 | 	}
25 | 	printf("The Reversed Array is\n");
26 | 	for(i=0;i<n;i++)
27 | 	{
28 | 		printf("%d\t",array[i]);	
29 | 	}
30 | 	free(array);
31 | }
32 | 


--------------------------------------------------------------------------------
/Hard/88.c:
--------------------------------------------------------------------------------
 1 | // Program to insert an element in array
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int *array;
 6 | 	int position,n,element,i;
 7 | 	printf("Enter the number of element\t");
 8 | 	scanf("%d",&n);
 9 | 	array=(int *)malloc((n+1)*sizeof(int));
10 | 	for(i=0;i<n;i++)
11 | 	{
12 | 		scanf("%d",&array[i]);	
13 | 	}
14 | 	printf("Enter the element\t");
15 | 	scanf("%d",&element);
16 | 	printf("Enter the position to insert\t");
17 | 	scanf("%d",&position);
18 | 	if(position>n)
19 | 		printf("\nPlease enter the valid position\n");
20 | 	else
21 | 	{
22 | 		for(i=n-1;i>=position-1;i--)
23 | 		{
24 | 			array[i+1]=array[i];	
25 | 		}
26 | 		array[position-1]=element;		
27 | 	}
28 | 	for(i=0;i<=n;i++)
29 | 	{
30 | 		printf("%d",array[i]);	
31 | 	}
32 | }
33 | 


--------------------------------------------------------------------------------
/Hard/89.c:
--------------------------------------------------------------------------------
 1 | //Program to sort array using Insertion sort
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,*array,i,j,flag=1;
 6 | 	printf("Enter number of elements\t");
 7 | 	scanf("%d",&n);
 8 | 	array=(int *)malloc(n*sizeof(int));
 9 | 	for(i=0;i<n;i++)
10 | 		scanf("%d",&array[i]);
11 | 	for(i=n-1;i>=0 && flag;i--)
12 | 	{
13 | 		flag=0;
14 | 		for(j=0;j<i;j++)
15 | 		{
16 | 			if(array[j]>array[j+1])
17 | 			{
18 | 				flag=1;
19 | 				array[j]=array[j]^array[j+1];
20 | 				array[j+1]=array[j]^array[j+1];
21 | 				array[j]=array[j]^array[j+1];	
22 | 			}
23 | 		}
24 | 	}
25 | 	printf("The Sorted Array using inserting sort is \n");
26 | 	for(i=0;i<n;i++)
27 | 		printf("%d\t",array[i]);
28 | 	free(array);
29 | }
30 | 


--------------------------------------------------------------------------------
/Hard/90.c:
--------------------------------------------------------------------------------
 1 | //Binary Search
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,*array,element,i;
 6 | 	printf("Enter the number of elements\t");
 7 | 	scanf("%d",&n);
 8 | 	array=(int *)malloc(n*sizeof(int));
 9 | 	for(i=0;i<n;i++)	
10 | 		scanf("%d",&array[i]);
11 | 	printf("Enter the element you want to search\t");
12 | 	scanf("%d",&element);
13 | 	if(binarysearch(array,0,n-1,element))
14 | 		printf("Element found");
15 | 	else
16 | 		printf("Element not found");
17 | 	free(array);
18 | 	
19 | }
20 | int binarysearch(int array[],int l,int r,int element)
21 | {
22 | 	if(r>=l)
23 | 	{
24 | 
25 | 		int mid=l+(r-l)/2;
26 | 		if(array[mid]==element)
27 | 			return mid;
28 | 		if(array[mid]>element)
29 | 			return binarysearch(array,l,mid-1,element);
30 | 		return binarysearch(array,mid+1,r,element);
31 | 	}
32 | 	return 0;
33 | }
34 | 


--------------------------------------------------------------------------------
/Hard/91.c:
--------------------------------------------------------------------------------
 1 | //Multiplication of two Matrices
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int m,n,q,p,i,j,k,matrix1[10][10],matrix2[10][10],result[10][10];
 6 | 	printf("\nEnter the number of rows and columns in first matrix\t");
 7 | 	scanf("%d\t%d",&m,&n);
 8 | 	printf("\nEnter the number of rows and columns in second matrix\t");
 9 | 	scanf("%d\t%d",&p,&q);
10 | 	if(n==p)
11 | 	{
12 | 		printf("Enter the values for first matrix\n");
13 | 		for(i=0;i<m;i++)
14 | 		{
15 | 			for(j=0;j<n;j++)
16 | 			{
17 | 				scanf("%d",&matrix1[i][j]);
18 | 			}
19 | 		}
20 | 		printf("Enter the values for second matrix\n");
21 | 		for(i=0;i<p;i++)
22 | 		{
23 | 			for(j=0;j<q;j++)
24 | 			{
25 | 				scanf("%d",&matrix2[i][j]);
26 | 			}
27 | 		}
28 | 		printf("\nThe Resultant Matrix is given by\n");
29 | 		for(i=0;i<m;i++)
30 | 		{
31 | 			for(j=0;j<q;j++)
32 | 			{
33 | 				result[i][j]=0;
34 | 				for(k=0;k<n;k++)
35 | 				{
36 | 					result[i][j]=result[i][j] + (matrix1[i][k]*matrix2[k][j]);
37 | 				}	
38 | 			printf("%d\t",result[i][j]);	
39 | 			}
40 | 			printf("\n");	
41 | 		}	
42 | 	}
43 | 	else
44 | 		printf("\nMultiplication not possible\t");
45 | }
46 | 


--------------------------------------------------------------------------------
/Hard/92.c:
--------------------------------------------------------------------------------
 1 | //Balancing symbols
 2 | #include<stdio.h>
 3 | char stack[40];
 4 | int top=-1;
 5 | void push(char c);
 6 | char pop();
 7 | int main()
 8 | {
 9 | 	char str[20];
10 | 	int i;
11 | 	//printf("Enter the expression");
12 | 	scanf("%s",str);
13 | 	printf("%s",str);
14 | 	for(i=0;str[i]!='\0';i++)
15 | 	{
16 | 		if(str[i]=='(' || str[i]=='[' || str[i]=='{')
17 | 			push(str[i]);
18 | 		else if(str[i]==')' || str[i]==']' || str[i]=='}')
19 | 		{
20 | 			if(strcmp(pop(),str[i]))
21 | 			{
22 | 				printf("\nPlease enter the correct expression\n");
23 | 				break;
24 | 			}
25 | 		}		
26 | 	}
27 | 	if(i==strlen(str) && top==-1)
28 | 	{
29 | 		printf("\nBalanced\n");	
30 | 	}
31 | }
32 | void push(char c)
33 | {
34 | 	if(top!=40)
35 | 	{
36 | 		strcpy(stack[top++],c);	
37 | 	}
38 | }
39 | char pop()
40 | {
41 | 	if(top!=-1)
42 | 		return stack[top--];
43 | }
44 | 
45 | 


--------------------------------------------------------------------------------
/Hard/93.c:
--------------------------------------------------------------------------------
 1 | #include<stdio.h>
 2 | #include<string.h>
 3 | int main()
 4 | {
 5 | 	char input_string[100];
 6 | 	int mid,i,k,j;
 7 | 	scanf("%s",input_string);
 8 | 	mid=strlen(input_string)/2;
 9 | 	for(i=1;i<=strlen(input_string);i++)
10 | 	{
11 | 		int temp=(i*2)-1,count=0;
12 | 		for(j=2*strlen(input_string)-1;j>=i;j--)
13 | 		{
14 | 			if(abs(temp)==j)
15 | 			{
16 | 				for(k=temp;count<i;k++)
17 | 				{
18 | 					if(count>=7)
19 | 					{
20 | 						printf("%c",input_string[(mid+count)%10]);
21 | 					}
22 | 					else
23 | 					{
24 | 						printf("%c",input_string[(mid+count)%strlen(input_string)]);
25 | 					}
26 | 					count++;
27 | 				}
28 | 			}
29 | 		}
30 | 		printf("\n");
31 | 	}
32 | }
33 | 


--------------------------------------------------------------------------------
/Hard/94.c:
--------------------------------------------------------------------------------
 1 | /*Given an integer array, write a function to reverse every set of  'k' numbers. Modify the same array without creating another array. Reverse the remaining elements even if it is less than 'k'. 
 2 | 
 3 | Example: 
 4 | Input:  {2, 1 , 3 , 5 , 8 , 6 , 7 , 9}   and k = 3 
 5 | Output:  {3 , 1 , 2 , 6 , 8 , 5 , 9 , 7}*/
 6 | #include<stdio.h>
 7 | int main()
 8 | {
 9 | 	int n,*input_array,i,k;
10 | 	printf("Enter the array size\t");
11 | 	scanf("%d",&n);
12 | 	input_array=(int *)malloc(n*sizeof(int));
13 | 	printf("Enter the elements\n");
14 | 	for(i=0;i<n;i++)
15 | 	{
16 | 		scanf("%d",&input_array[i]);
17 | 	}
18 | 	printf("Enter the value of K\t");
19 | 	scanf("%d",&k);
20 | 	for(i=0;i<n;i+=k)
21 | 	{
22 | 		int left_element = i;
23 | 		int right_element=min(i+k-1,n-1);
24 | 		//printf("The right element : %d",right_element);
25 | 		while(left_element<right_element)
26 | 			{
27 | 				input_array[left_element]^=input_array[right_element];
28 | 				input_array[right_element]=input_array[left_element]^input_array[right_element];
29 | 				input_array[left_element]^=input_array[right_element];
30 | 				left_element++;
31 | 				right_element--;		
32 | 			}
33 | 	}
34 | 	for(i=0;i<n;i++)
35 | 	{
36 | 		printf("%d\t",input_array[i]);
37 | 	}
38 | 	free(input_array);
39 | }
40 | int min(int a,int b)
41 | {
42 | 	int minimum;
43 | 	if(a<b)
44 | 	{
45 | 		minimum=a;
46 | 	}
47 | 	else
48 | 	{
49 | 		minimum=b;
50 | 	}
51 | 	return minimum;
52 | }
53 | 


--------------------------------------------------------------------------------
/Hard/95.c:
--------------------------------------------------------------------------------
 1 | /*Given a String with numbers and operators. Perform the operation on the numbers in their respective order. Operator precedence need not be considered. The input string will have the numbers followed by the operators. 
 2 | 
 3 | Input: "12345 * + - + " 	
 4 | Result: 6 [Explanation: 1 * 2 + 3 - 4 + 5 = 6]
 5 | 
 6 | Input: "374291 - - * + -" 	
 7 | Result: -8 [Explanation: 3 - 7 - 4 * 2 + 9 - 1 = -8]
 8 | 
 9 | Input: "67542 - / + -" 		
10 | Result: 2*/
11 | #include<stdio.h>
12 | int main()
13 | {
14 | 	char input_string[20],char_array[20];
15 | 	int i,int_array[20],int_count=0,char_count=0;
16 | 	scanf("%s",input_string);
17 | 	for(i=0;input_string[i];i++)
18 | 	{
19 | 		if(input_string[i]>=48 && input_string[i]<=57)
20 | 		{
21 | 			int_array[int_count++]=input_string[i]-'0';
22 | 		}
23 | 		else
24 | 		{
25 | 			char_array[char_count++]=input_string[i];
26 | 		}
27 | 	}
28 | 	if(int_count==char_count+1)
29 | 	{
30 | 		int value=int_array[0];
31 | 		for(i=0;i<char_count;i++)
32 | 		{
33 | 			if(char_array[i]=='+')
34 | 			{
35 | 				value+=int_array[i+1];
36 | 			}
37 | 			else if(char_array[i]=='-')
38 | 			{
39 | 				value-=int_array[i+1];
40 | 			}
41 | 			else if(char_array[i]=='*')
42 | 			{
43 | 				value*=int_array[i+1];
44 | 			}
45 | 			else if(char_array[i]=='/')
46 | 			{
47 | 				value/=int_array[i+1];
48 | 			}
49 | 			else if(char_array[i]=='%')
50 | 			{
51 | 				value=value%int_array[i+1];
52 | 			}
53 | 
54 | 		}
55 | 		printf("%d",value);
56 | 	}
57 | }
58 | 


--------------------------------------------------------------------------------
/Hard/96.c:
--------------------------------------------------------------------------------
  1 | /*You are given two sorted integer arrays A and B. The sort order can be ascending or descending. Write a program to create an array C that contains integers from A and B. C should be in ascending order and shouldn't have any duplicates. 
  2 | Note: Removal of duplicates and ordering has to be done while adding elements to C. i.e. don't write separate loops to sort and remove duplicates. 
  3 | 
  4 | Examples: 
  5 | Input: [3, 6, 9], [8, 7, 5] 
  6 | Output: [3, 5, 6, 7, 8, 9] 
  7 | Input: [9, 9, 6, 3], [5, 7, 8, 9] 
  8 | Output: [3, 5, 6, 7, 8, 9] 
  9 | Input: [9, 6], [5, 17, 21] 
 10 | Output: [5, 6, 9, 17, 21] */
 11 | #include<stdio.h>
 12 | int main()
 13 | {
 14 | 	int size_1,size_2,*first_array,*second_array,*result_array,i,j,pointer1,pointer2,flag1=0,flag2=0,k=0;
 15 | 	printf("Enter the size of array 1\t");
 16 | 	scanf("%d",&size_1);
 17 | 	first_array=(int *)malloc(size_1*sizeof(int));
 18 | 	printf("Enter the first array elements\n");
 19 | 	for(i=0;i<size_1;i++)
 20 | 	{
 21 | 		scanf("%d",&first_array[i]);
 22 | 	}
 23 | 	printf("Ener the size of array 2\t");
 24 | 	scanf("%d",&size_2);
 25 | 	second_array=(int *)malloc(size_2*sizeof(int));
 26 | 	printf("Enter the second array elements\n");
 27 | 	for(i=0;i<size_2;i++)
 28 | 	{
 29 | 		scanf("%d",&second_array[i]);
 30 | 	}
 31 | 	result_array=(int *)malloc((size_1+size_2)*sizeof(int));
 32 | 	if(first_array[0]>first_array[size_1-1])
 33 | 	{
 34 | 		pointer1=size_1;
 35 | 		flag1=1;	//flag 1 means descending array
 36 | 	}
 37 | 	else
 38 | 	{
 39 | 		pointer1=0;
 40 | 		flag1=0;
 41 | 	}
 42 | 	if(second_array[0]>second_array[size_2-1])
 43 | 	{
 44 | 		pointer2=size_2;
 45 | 		flag2=1;
 46 | 	}
 47 | 	else
 48 | 	{
 49 | 		pointer2=0;
 50 | 		flag2=0;
 51 | 	}
 52 | 	
 53 | 	printf("First array minimum value %d\n",pointer1);
 54 | 	printf("Second array minimum value %d\n",pointer2);
 55 | 	if(flag1==0 && flag2==0)
 56 | 	{
 57 | 		for(i=pointer1,j=pointer2;i<size_1 && j<size_2;)
 58 | 		{
 59 | 			if(first_array[i]<second_array[j])
 60 | 			{
 61 | 				result_array[k]=first_array[i];
 62 | 				i++;k++;
 63 | 			}
 64 | 			else if(first_array[i]>second_array[j])
 65 | 			{
 66 | 				result_array[k]=second_array[j];
 67 | 				j++;k++;
 68 | 			}
 69 | 			else
 70 | 			{
 71 | 				result_array[k]=second_array[j];
 72 | 				i++;
 73 | 				j++;
 74 | 				k++;
 75 | 			}
 76 | 		}
 77 | 	}
 78 | 	else if(flag1==1 && flag2==0)
 79 | 	{
 80 | 		for(i=pointer1,j=pointer2;i>=0 && j<size_2;)
 81 | 		{
 82 | 			if(first_array[i]<second_array[j])
 83 | 			{
 84 | 				result_array[k]=first_array[i];
 85 | 				i--;k++;
 86 | 			}
 87 | 			else if(first_array[i]>second_array[j])
 88 | 			{
 89 | 				result_array[k]=second_array[j];
 90 | 				j++;k++;
 91 | 			}
 92 | 			else
 93 | 			{
 94 | 				result_array[k]=second_array[j];
 95 | 				i--;
 96 | 				j++;
 97 | 				k++;
 98 | 			}
 99 | 		}
100 | 	}
101 | 	for(i=0;i<k;i++)
102 | 	{
103 | 		printf("%d\t",result_array[i]);
104 | 	}
105 | 	
106 | }
107 | 


--------------------------------------------------------------------------------
/Hard/97.c:
--------------------------------------------------------------------------------
 1 | /*Alternate sorting: Given an array of integers, rearrange the array in such a way that the first element is first maximum and second element is first minimum and repeat the same sorting for the subsequent pairs
 2 | 
 3 | first element - first maximum
 4 | second element - first minimum
 5 | third element - second maximum
 6 | fourth element - second minimum ....
 7 | 
 8 | Example:
 9 | Input : {1, 2, 3, 4, 5, 6, 7}
10 | Output : {7, 1, 6, 2, 5, 3, 4}*/
11 | #include<stdio.h>
12 | int main()
13 | {
14 | 	int n,*input_array,i,j;
15 | 	printf("Enter the value of N\t");
16 | 	scanf("%d",&n);
17 | 	input_array=(int *)malloc(n*sizeof(int));
18 | 	for(i=0;i<n;i++)
19 | 	{
20 | 		scanf("%d",&input_array[i]);
21 | 	}
22 | 	for(i=0;i<n-1;i++)
23 | 	{
24 | 		for(j=i+1;j<n;j++)
25 | 		{
26 | 			if(i%2)
27 | 			{
28 | 				if(input_array[i]>input_array[j])
29 | 				{
30 | 					input_array[i]=input_array[i]+input_array[j]-(input_array[j]=input_array[i]);
31 | 				}
32 | 			}
33 | 			else
34 | 			{
35 | 				if(input_array[i]<input_array[j])
36 | 				{
37 | 					input_array[i]=input_array[i]+input_array[j]-(input_array[j]=input_array[i]);
38 | 				}
39 | 			}
40 | 		}
41 | 	}
42 | 	for(i=0;i<n;i++)
43 | 	{
44 | 		printf("%d\t",input_array[i]);
45 | 	}
46 | 	free(input_array);
47 | }
48 | 
49 | 


--------------------------------------------------------------------------------
/Hard/a.out:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/Ratheshprabakar/C-Complete-practice/6868777d2e4bf56713d17e358f96bb542817419c/Hard/a.out


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
  1 |                     GNU GENERAL PUBLIC LICENSE
  2 |                        Version 2, June 1991
  3 | 
  4 |  Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
  5 |  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  6 |  Everyone is permitted to copy and distribute verbatim copies
  7 |  of this license document, but changing it is not allowed.
  8 | 
  9 |                             Preamble
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 15 | General Public License applies to most of the Free Software
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 91 | of it, thus forming a work based on the Program, and copy and
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 93 | above, provided that you also meet all of these conditions:
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236 | 
237 |   9. The Free Software Foundation may publish revised and/or new versions
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248 | Foundation.
249 | 
250 |   10. If you wish to incorporate parts of the Program into other free
251 | programs whose distribution conditions are different, write to the author
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257 | 
258 |                             NO WARRANTY
259 | 
260 |   11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
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269 | 
270 |   12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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279 | 
280 |                      END OF TERMS AND CONDITIONS
281 | 
282 |             How to Apply These Terms to Your New Programs
283 | 
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291 | the "copyright" line and a pointer to where the full notice is found.
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315 |     Gnomovision version 69, Copyright (C) year name of author
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317 |     This is free software, and you are welcome to redistribute it
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323 | mouse-clicks or menu items--whatever suits your program.
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329 |   Yoyodyne, Inc., hereby disclaims all copyright interest in the program
330 |   `Gnomovision' (which makes passes at compilers) written by James Hacker.
331 | 
332 |   <signature of Ty Coon>, 1 April 1989
333 |   Ty Coon, President of Vice
334 | 
335 | This General Public License does not permit incorporating your program into
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337 | consider it more useful to permit linking proprietary applications with the
338 | library.  If this is what you want to do, use the GNU Lesser General
339 | Public License instead of this License.
340 | 


--------------------------------------------------------------------------------
/Moderate/34.c:
--------------------------------------------------------------------------------
 1 | //Program to accept two integer numbers and print the GCD(Greatest Common Divisor)
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int a,b,max=100,i;
 6 | 	printf("Enter the value of a and b\n");
 7 | 	scanf("%d\t%d",&a,&b);
 8 | 	if(a>b)
 9 | 		max=a;
10 | 	else
11 | 		max=b;
12 | 	for(i=max;i>=1;i--)
13 | 	{
14 | 		if(a%i==0 && b%i==0)
15 | 		{
16 | 			printf("The GCD of two numbers are \t%d",i);
17 | 			break;	
18 | 		}		
19 | 	}
20 | 	
21 | }
22 | 


--------------------------------------------------------------------------------
/Moderate/35.c:
--------------------------------------------------------------------------------
 1 | // Program to find power of number.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int a,b,i,value=1;
 6 | 	printf("Enter the base value\t");
 7 | 	scanf("%d",&a);
 8 | 	printf("Enter the exponent value\t");
 9 | 	scanf("%d",&b);
10 | 	for(i=0;i<b;i++)
11 | 	{
12 | 		value=value*a;	
13 | 	}
14 | 	printf("The Value is \t%d",value);
15 | 	
16 | }
17 | 
18 | 


--------------------------------------------------------------------------------
/Moderate/36.c:
--------------------------------------------------------------------------------
 1 | //Program to calculate HCF & LCM.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int a,b,x,y,temp;
 6 | 	printf("Enter two numbers\n");
 7 | 	scanf("%d\t%d",&a,&b);
 8 | 	x=a;
 9 | 	y=b;
10 | 	while(y!=0)
11 | 	{
12 | 		temp=y;
13 | 		y=x%y;
14 | 		x=temp;		
15 | 	}
16 | 	printf("The HCF of %d and %d are %d\n",a,b,x);
17 | 	printf("The LCM of %d and %d are %d\n",a,b,(a*b)/x);
18 | 	
19 | }
20 | 


--------------------------------------------------------------------------------
/Moderate/37.c:
--------------------------------------------------------------------------------
 1 | //Program to find largest among 3 numbers using ternary operator.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int a,b,c,x;
 6 | 	printf("Enter the three numbers\n");
 7 | 	scanf("%d\t%d\t%d",&a,&b,&c);	
 8 | 	x=(a>b)?((a>c)?a:c):((b>c)?b:c);
 9 | 	printf("The Largest of three numbers are %d",x);
10 | }
11 | 


--------------------------------------------------------------------------------
/Moderate/38.c:
--------------------------------------------------------------------------------
 1 | //Program to find largest number of 'n' numbers.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,max=0,i;
 6 | 	int *a;
 7 | 	printf("Enter the value of N\t");
 8 | 	scanf("%d",&n);
 9 | 	a=(int *)malloc(n*sizeof(int));
10 | 	for(i=0;i<n;i++)
11 | 	{
12 | 		scanf("%d",&a[i]);
13 | 		if(a[i]>max)
14 | 		{
15 | 			max=a[i];
16 | 		}	
17 | 	}
18 | 	free(a);
19 | 	printf("The Largest Number among %d numbers are %d",n,max);
20 | }
21 | 


--------------------------------------------------------------------------------
/Moderate/39.c:
--------------------------------------------------------------------------------
 1 | //Program to check whether the number is neon number or not.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,temp,sum=0;
 6 | 	printf("Enter the number\t");
 7 | 	scanf("%d",&n);
 8 | 	temp=n*n;
 9 | 	while(temp>0)
10 | 	{
11 | 		sum+=(temp%10);
12 | 		temp/=10;
13 | 	}
14 | 	(sum==n)?printf("Neon Number\n"):printf("Not a Neon Number\n");
15 | }
16 | 


--------------------------------------------------------------------------------
/Moderate/40.c:
--------------------------------------------------------------------------------
 1 | //Program to check Niven number (Harshad number)
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,temp,sum=0;
 6 | 	printf("Enter the number\t");
 7 | 	scanf("%d",&n);
 8 | 	temp=n;
 9 | 	while(n>0)
10 | 	{
11 | 		sum+=(n%10);
12 | 		n/=10;	
13 | 	}
14 | 	(temp%sum==0)?printf("Harshed Or Niven Number\n"):printf("Not a Harshed or Niven Number\n");
15 | }
16 | 


--------------------------------------------------------------------------------
/Moderate/41.c:
--------------------------------------------------------------------------------
 1 | // Program to check whether the number is palindrome or not
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,temp,num=0;
 6 | 	printf("Enter the Number\t");
 7 | 	scanf("%d",&n);
 8 | 	temp=n;
 9 | 	while(n>0)
10 | 	{
11 | 		num*=10;
12 | 		num+=(n%10);
13 | 		n/=10;	
14 | 	}
15 | 	(temp==num)?printf("Palindrome\n"):printf("Not a Palindrome\n");
16 | }
17 | 


--------------------------------------------------------------------------------
/Moderate/42.c:
--------------------------------------------------------------------------------
 1 | //Program to check perfect number
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,i,sum=0;
 6 | 	printf("Enter the number\t");
 7 | 	scanf("%d",&n);
 8 | 	for(i=1;i<n;i++)
 9 | 	{
10 | 		if(n%i==0)
11 | 		{
12 | 			sum+=i;
13 | 		}
14 | 	}
15 | 	(sum==n)?printf("Perfect Number\n"):printf("Not a perfect Number\n");	
16 | }
17 | 


--------------------------------------------------------------------------------
/Moderate/43.c:
--------------------------------------------------------------------------------
 1 | // Program to find the square root of a number
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n;
 6 | 	printf("Enter the Number\t");
 7 | 	scanf("%d",&n);
 8 | 	printf("The Squar root of %d is %.2f",n,sqrt(n));
 9 | }
10 | 


--------------------------------------------------------------------------------
/Moderate/44.c:
--------------------------------------------------------------------------------
 1 | //Program to print sum of 'n' prime numbers
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,count=0,i,j,sum=0;
 6 | 	printf("Enter the N value\t");
 7 | 	scanf("%d",&n);
 8 | 	for(i=2;count<=n;i++)
 9 | 	{
10 | 		for(j=2;j<=i-1;j++)
11 | 		{
12 | 			if(i%j==0)
13 | 			{
14 | 				break;	
15 | 			}	
16 | 		}
17 | 		if(j==i)
18 | 		{
19 | 			count++;
20 | 			sum+=i;	
21 | 		}
22 | 		if(count==n)
23 | 			break;	
24 | 	}
25 | 	printf("The Sum of first %d prime numbers are\t%d",n,sum);
26 | }
27 | 


--------------------------------------------------------------------------------
/Moderate/45(Pending).c:
--------------------------------------------------------------------------------
1 | // Program to print sum of factorial series 1/1! + 2/2! +...1/N!
2 | #include<stdio.h>
3 | int main()
4 | {
5 | 	int n;
6 | }
7 | 


--------------------------------------------------------------------------------
/Moderate/46(Pending).c:
--------------------------------------------------------------------------------
1 | //Program to calculate the sum of 'n' terms in Taylor series.(77)
2 | 


--------------------------------------------------------------------------------
/Moderate/47.c:
--------------------------------------------------------------------------------
 1 | // Program to swap two numbers without using third variable
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,a,b;
 6 | 	printf("Enter the numbers a and b\n");
 7 | 	scanf("%d\t%d",&a,&b);
 8 | 	printf("The Values before swapping are %d and %d",a,b);
 9 | 	a=a+b;
10 | 	b=a-b;
11 | 	a=a-b;
12 | 	printf("\nThe Values after swapping are %d and %d",a,b);
13 | }
14 | 


--------------------------------------------------------------------------------
/Moderate/48.c:
--------------------------------------------------------------------------------
 1 | //Program to swap two numbers using bitwise XOR.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int a,b;
 6 | 	printf("Enter two numbers\n");
 7 | 	scanf("%d\t%d",&a,&b);
 8 | 	printf("The Values before swapping are %d and %d",a,b);
 9 | 	a=a^b;
10 | 	b=a^b;
11 | 	a=a^b;
12 | 	printf("\nThe Values after swapping are %d and %d",a,b);
13 | }
14 | 


--------------------------------------------------------------------------------
/Moderate/49.c:
--------------------------------------------------------------------------------
 1 | //Program to swap two numbers using pointer
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int a,b;
 6 | 	int *ptr1,*ptr2,*temp;
 7 | 	printf("Enter two numbers\n");
 8 | 	scanf("%d\t%d",&a,&b);
 9 | 	printf("The Value before swapping are %d and %d",a,b);
10 | 	ptr1=&a;
11 | 	ptr2=&b;
12 | 	*temp=*ptr1;
13 | 	*ptr1=*ptr2;
14 | 	*ptr2=*temp;
15 | 	printf("\nThe Value after swapping are %d and %d",a,b);
16 | 	
17 | 	
18 | }
19 | 


--------------------------------------------------------------------------------
/Moderate/50.c:
--------------------------------------------------------------------------------
 1 | //Program to add two numbers using pointer
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int a,b,sum=0;
 6 | 	int *ptr1,*ptr2;
 7 | 	printf("Enter two numbers\n");
 8 | 	scanf("%d\t%d",&a,&b);
 9 | 	ptr1=&a;
10 | 	ptr2=&b;
11 | 	sum=(*ptr1)+(*ptr2);
12 | 	printf("The Sum of two numbers %d and %d are %d",a,b,sum);
13 | }
14 | 


--------------------------------------------------------------------------------
/Moderate/51.c:
--------------------------------------------------------------------------------
 1 | //Program to add first and last digit of a number.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,sum=0,second;
 6 | 	printf("Enter the number\t");
 7 | 	scanf("%d",&n);
 8 | 	sum=n%10;
 9 | 	while(n>0)
10 | 	{
11 | 		second=n%10;
12 | 		n/=10;	
13 | 	}
14 | 	printf("\nThe sum of first and last digit is %d",sum+second);
15 | 		
16 | }
17 | 


--------------------------------------------------------------------------------
/Moderate/52.c:
--------------------------------------------------------------------------------
 1 | // Program to find area of triangle using Heron's formula.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int a,b,c,s;
 6 | 	printf("Enter tthe three sides of the triangle\n");
 7 | 	scanf("%d\t%d\t%d",&a,&b,&c);
 8 | 	s=(a+b+c)/2;
 9 | 	printf("\nThe Area of triangle is %.2f",sqrt(s*(s-a)*(s-b)*(s-c)));
10 | 		
11 | }
12 | 


--------------------------------------------------------------------------------
/Moderate/53.c:
--------------------------------------------------------------------------------
 1 | //Program to convert Binary to Decimal.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,k=0,sum=0,rem;
 6 | 	printf("Enter the binary number\t");
 7 | 	scanf("%d",&n);
 8 | 	while(n>0)
 9 | 	{
10 | 		rem=n%10;
11 | 		sum+=(rem *pow(2,k));
12 | 		k++;
13 | 		n/=10;
14 | 	}
15 | 	printf("\nThe Decimal value is %d",sum);
16 | }
17 | 


--------------------------------------------------------------------------------
/Moderate/54.c:
--------------------------------------------------------------------------------
 1 | //Program to convert Decimal numbers to Binary
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,c,k;
 6 | 	printf("Enter the Decimal Number\t");
 7 | 	scanf("%d",&n);
 8 | 	printf("The Binary Notation of %d is\t",n);
 9 | 	for(c=7;c>=0;c--)
10 | 	{
11 | 		k=n>>c;
12 | 		(k&1)?printf("1"):printf("0");
13 | 	}
14 | }
15 | 


--------------------------------------------------------------------------------
/Moderate/55(Pending).c:
--------------------------------------------------------------------------------
1 | //Program to find f(x) by Lagrange's interpolation method.
2 | #include<stdio.h>
3 | int main()
4 | {
5 | 	int
6 | }
7 | 


--------------------------------------------------------------------------------
/Moderate/56.c:
--------------------------------------------------------------------------------
 1 | // Program to check the leap year.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n;
 6 | 	printf("Enter the year\t");
 7 | 	scanf("%d",&n);
 8 | 	(n%4==0 || n%400==0)?printf("A leap year\n"):printf("Not a leap year\n");
 9 | 	
10 | }
11 | 


--------------------------------------------------------------------------------
/Moderate/57.c:
--------------------------------------------------------------------------------
 1 | //Program to find nCr & nPr
 2 | #include<stdio.h>
 3 | int factorial(int n);
 4 | int result=1;
 5 | int main()
 6 | {
 7 | 	int n,r;
 8 | 	long ncr,npr;
 9 | 	printf("Enter the value of n and r\n");
10 | 	scanf("%d\t%d",&n,&r);
11 | 	npr=factorial(n)/factorial(n-r);
12 | 	ncr=factorial(n)/(factorial(n-r)*factorial(r));
13 | 	printf("The ncr and npr are %ld and %ld",ncr,npr);
14 | 
15 | }
16 | int factorial(int n)
17 | {
18 | 	int i;
19 | 	result=1;
20 | 	for(i=n;i>=1;i--)
21 | 	{
22 | 		result*=i;	
23 | 	}
24 | 	return result;
25 | }
26 | 


--------------------------------------------------------------------------------
/Moderate/58(Pending).c:
--------------------------------------------------------------------------------
1 | //Program for Newton Raphson General
2 | #include<stdio.h>
3 | 
4 | 


--------------------------------------------------------------------------------
/Moderate/59.c:
--------------------------------------------------------------------------------
 1 | // Program to calculate the sum of even numbers from 1 to n.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	int n,i,sum=0;
 6 | 	printf("Enter the value of N\t");
 7 | 	scanf("%d",&n);
 8 | 	for(i=2;i<=n;i=i+2)
 9 | 	{
10 | 		sum+=i;
11 | 	}
12 | 	printf("The Sum of even numbers from 1 to n is %d",sum);
13 | }
14 | 


--------------------------------------------------------------------------------
/Moderate/60_pending.c:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/Ratheshprabakar/C-Complete-practice/6868777d2e4bf56713d17e358f96bb542817419c/Moderate/60_pending.c


--------------------------------------------------------------------------------
/Moderate/61.c:
--------------------------------------------------------------------------------
 1 | // Program to add two strings without using concat() function
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	char string1[50],string2[100];
 6 | 	int i,index;
 7 | 	printf("Enter the first string\t");
 8 | 	gets(string1);
 9 | 	printf("Enter the second string\t");
10 | 	gets(string2);
11 | 	index=strlen(string1);
12 | 	for(i=0;i<strlen(string2);i++)
13 | 	{
14 | 		string1[index]=string2[i];
15 | 		index++;
16 | 	}
17 | 	printf("Concated String is %s",string1);
18 | }
19 | 


--------------------------------------------------------------------------------
/Moderate/62.c:
--------------------------------------------------------------------------------
 1 | //Program to check vowels in string
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	char string[100];
 6 | 	int i,count=0;
 7 | 	printf("Enter the string\t");
 8 | 	gets(string);
 9 | 	for(i=0;string[i]!='\0';i++)
10 | 	{
11 | 		if(string[i]=='a'||string[i]=='e' || string[i]=='i' || string[i]=='e' || string[i]=='u' || string[i]=='A' || string[i]=='E' || string[i]=='I' || string[i]=='O' || string[i]=='U')
12 | 			count++;
13 | 	}
14 | 	printf("Number of vowels in the string %s is %d",string,count);
15 | }
16 | 


--------------------------------------------------------------------------------
/Moderate/63.c:
--------------------------------------------------------------------------------
 1 | // Program to compare two strings
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	char string1[100],string2[100];
 6 | 	printf("Enter the first string\t");
 7 | 	gets(string1);
 8 | 	printf("Enter the second string\t");
 9 | 	gets(string2);
10 | 	(!strcmp(string1,string2))?printf("\nTwo Strings are equal\n"):printf("\nTwo strings are not equal\n");
11 | 		
12 | }
13 | 


--------------------------------------------------------------------------------
/Moderate/64.c:
--------------------------------------------------------------------------------
 1 | // Program to compare strings without using strcmp() function.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	char string1[100],string2[100];
 6 | 	int i;
 7 | 	printf("Enter the first string\t");
 8 | 	gets(string1);
 9 | 	printf("Enter the second string\t");
10 | 	gets(string2);
11 | 	if(strlen(string1)==strlen(string2))
12 | 	{
13 | 		for(i=0;i<strlen(string1);i++)
14 | 		{
15 | 			if(string1[i]!=string2[i])
16 | 			{
17 | 				printf("\nTwo Strings are not equal");
18 | 				break;	
19 | 			}	
20 | 		}	
21 | 		if(i==strlen(string1))
22 | 		{
23 | 			printf("\nTwo Strings are equal");		
24 | 		}
25 | 	}
26 | 	else
27 | 	{
28 | 		printf("\nTwo Strings are not equal");
29 | 	}
30 | }
31 | 


--------------------------------------------------------------------------------
/Moderate/65.c:
--------------------------------------------------------------------------------
 1 | // Program to convert string from uppercase to lowercase
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	char string1[100];
 6 | 	int i;
 7 | 	printf("Enter the string\t");
 8 | 	gets(string1);
 9 | 	for(i=0;i<strlen(string1);i++)
10 | 	{
11 | 		if(string1[i]>=65 && string1[i]<=90)		
12 | 			string1[i]=string1[i]+32;
13 | 	}
14 | 	printf("The string is \t%s",string1);
15 | }
16 | 


--------------------------------------------------------------------------------
/Moderate/66.c:
--------------------------------------------------------------------------------
 1 | //Program to copy char array / copy string.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	char string1[100],temp_string[100];
 6 | 	printf("Enter the string\t");
 7 | 	gets(string1);
 8 | 	strcpy(temp_string,string1);
 9 | 	printf("The Copied string is \t%s",temp_string);
10 | }
11 | 


--------------------------------------------------------------------------------
/Moderate/67.c:
--------------------------------------------------------------------------------
 1 | //Program to copy string without using strcpy() function.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	char string1[100];
 6 | 	char *temp_string;
 7 | 	int i;
 8 | 	printf("Enter the string\t");
 9 | 	scanf("%s",string1);
10 | 	temp_string=(char *)malloc((strlen(string1)+1)*sizeof(char));
11 | 	for(i=0;i<strlen(string1);i++)
12 | 	{
13 | 		temp_string[i]=string1[i];
14 | 	}
15 | 	printf("The copied string is\t%s",temp_string);
16 | 	free(temp_string);
17 | }
18 | 


--------------------------------------------------------------------------------
/Moderate/68.c:
--------------------------------------------------------------------------------
 1 | // Program to count frequency of characters in a string.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	char string[100];
 6 | 	int i;
 7 | 	int *count;
 8 | 	printf("Enter the string\t");
 9 | 	gets(string);
10 | 	count=(int *)malloc(27*sizeof(int));
11 | 	for(i=0;i<strlen(string);i++)
12 | 	{
13 | 		count[string[i]-97]++;
14 | 	}
15 | 	for(i=0;i<26;i++)
16 | 	{
17 | 		if(count[i]!=0)		
18 | 			printf("\n%c occours %d times",'a'+i,count[i]);	
19 | 	}
20 | 	free(count);
21 | }
22 | 


--------------------------------------------------------------------------------
/Moderate/69.c:
--------------------------------------------------------------------------------
 1 | //Program to count total number of uppercase and lowercase in a string.
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	char string[100];
 6 | 	int i,caps=0,small=0;
 7 | 	printf("Enter the string\t");
 8 | 	gets(string);
 9 | 	for(i=0;i<strlen(string);i++)
10 | 	{
11 | 		if(string[i]>=65 && string[i]<=90)
12 | 			caps++;
13 | 		else if(string[i]>=97 && string[i]<=122)
14 | 			small++;
15 | 	}
16 | 	printf("\nThe string %s contains %d uppercase and  %d lowercase letters",string,caps,small);
17 | }
18 | 


--------------------------------------------------------------------------------
/Moderate/70.c:
--------------------------------------------------------------------------------
 1 | //Program to calculate the length of string
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	char string[100];
 6 | 	printf("Enter the string\t");
 7 | 	gets(string);
 8 | 	printf("\nThe Length of the string is \t%d",strlen(string));
 9 | }
10 | 


--------------------------------------------------------------------------------
/Moderate/71.c:
--------------------------------------------------------------------------------
 1 | //Program to calculate the length of string without using strlen() function
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	char string[100];
 6 | 	int i;
 7 | 	printf("Enter the string\t");
 8 | 	gets(string);
 9 | 	for(i=0;string[i]!='\0';i++);
10 | 	printf("The Length of the string is \t%d ",i);
11 | }
12 | 


--------------------------------------------------------------------------------
/Moderate/72.c:
--------------------------------------------------------------------------------
 1 | //Program to check the palindrome of string
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	char string[100];
 6 | 	int i,j;
 7 | 	printf("Enter the string\t");
 8 | 	gets(string);
 9 | 	for(i=0,j=strlen(string)-1;i<strlen(string)/2;i++,j--)
10 | 	{
11 | 		if(string[i]!=string[j])
12 | 		{
13 | 			printf("\nNot a palindrome");
14 | 			break;	
15 | 		}
16 | 	}
17 | 	if(i==strlen(string)/2 || i==j)
18 | 	{
19 | 		printf("\nPalindrome");
20 | 	}
21 | 	
22 | }
23 | 


--------------------------------------------------------------------------------
/Moderate/73.c:
--------------------------------------------------------------------------------
 1 | //Program to check the palindrome of word using array
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	char string[100];
 6 | 	int i,j;
 7 | 	printf("Enter the string\t");
 8 | 	gets(string);
 9 | 	for(i=0,j=strlen(string)-1;i<strlen(string)/2;i++,j--)
10 | 	{
11 | 		if(string[i]!=string[j])
12 | 		{
13 | 			printf("\nNot a palindrome");
14 | 			break;	
15 | 		}
16 | 	}
17 | 	if(i==strlen(string)/2 || i==j)
18 | 	{
19 | 		printf("\nPalindrome");
20 | 	}
21 | 
22 | 	
23 | }
24 | 


--------------------------------------------------------------------------------
/Moderate/74.c:
--------------------------------------------------------------------------------
 1 | //Program to remove white space in string
 2 | #include<stdio.h>
 3 | int main()
 4 | {
 5 | 	char string[100];
 6 | 	int i,j=0;
 7 | 	printf("Enter the string\t");
 8 | 	gets(string);
 9 | 	for(i=0;i!=strlen(string);i++)
10 | 	{
11 | 		if(string[i] !=' ')
12 | 			string[j++]=string[i];
13 | 	}
14 | 	string[j]='\0';
15 | 	printf("Your string is\t%s",string);
16 | }
17 | 


--------------------------------------------------------------------------------
/Moderate/a.out:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/Ratheshprabakar/C-Complete-practice/6868777d2e4bf56713d17e358f96bb542817419c/Moderate/a.out


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
  1 | # C-Complete-practice
  2 | This repository will contains C programs from beginners to advance level. This will help the newbie to learn the programming from basics. I made over the plan, follow this path to explore yourself in the basic language C :)
  3 | 
  4 | 
  5 | **Basics :**
  6 | * [Program to print "Hello World!!"](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/1.c)
  7 | * [Program to assign values of two numbers and print their addition](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/2.c)
  8 | * [Program to accept values of two numbers and print their addition](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/3.c)
  9 | * [Program to print simple interest](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/4.c)
 10 | * [Program to accept value of radius and print area of a circle](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/5.c)
 11 | * [Program to accept a number from user and print it’s square & cube](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/6.c)
 12 | * [Program to accept two values of a & b and swap their values](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/7.c)
 13 | * [Program to accept two number and print largest among them](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/8.c)
 14 | * [Program to accept a number and check whether the number is Positive, Negative or Zero](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/9.c)
 15 | * [Program to check whether the number is even or odd](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/10.c)
 16 | * [Program to accept three numbers from user and print them in ascending and decending order](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/11.c)
 17 | * [ Program to find the roots of a quadratic equation](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/12.c)
 18 | * [Program to accept rollnumber and marks of three subjects from user and print total marks, average and grade](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/13.c)
 19 | * [Program to print numbers from 1 to n using while loop](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/14.c)
 20 | * [Program to print numbers from n to 1 using Do While loop](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/15.c)
 21 | * [Program to print first n even numbers](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/16.c)
 22 | * [Program to accept a number and print that number in reverse order.Ex:- 1024
 23 | Output:- 4201](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/17.c)
 24 | * [Program to accept a number and print sum of it’s digits](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/18.c)
 25 | * [Program to take a number from user and check whether it is Armstrong number or not](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/19.c)
 26 | * [Program to take number from user and print table of that number](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/20.c)
 27 | * [Program to accept number and print it's factorial](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/21.c)
 28 | * [Program to accept number and print if it is prime number or not](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/22.c)
 29 | * [Program to print 'n' prime numbers](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/23.c)
 30 | * [Program to accept a number and print Fibonacci sequence](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/24.c)
 31 | * [Add 'n' numbers](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/25.c)
 32 | * [Add 'n' numbers using array](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/26.c)
 33 | * [Program to accept a number and add the digits of that number](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/27.c)
 34 | * [Program to accept a number and add the digits of that number using recursion](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/28.c)
 35 | * [Average of numbers](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/29.c)
 36 | * [Program to calculate Square of 'n' numbers](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/30.c)
 37 | * [Program to take an alphabet from user and check whether it is a vowel or not](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/31.c)
 38 | * [Program to take two numbers and check whether they are amicable numbers or not](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/32.c)
 39 | * [Program to accept a number and print the factors of that number](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Basics/33.c)
 40 | 
 41 | **Moderate :**
 42 | 
 43 | * [ Program to accept two integer numbers and print the GCD(Greatest Common Divisor)](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/34.c)
 44 | * [Program to find power of number](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/35.c)
 45 | * [Program to calculate HCF & LCM](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/36.c)
 46 | * [Program to find largest among 3 numbers using ternary operator](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/37.c)
 47 | * [Program to find largest number of 'n' numbers](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/38.c)
 48 | * [Program to check whether the number is neon number or not](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/39.c)
 49 | * [Program to check Niven number (Harshad number)](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/40.c)
 50 | * [Program to check whether the number is palindrome or not](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/41.c)
 51 | * [Program to check perfect number.](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/42.c)
 52 | * [Program to find the square root of a number](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/43.c)
 53 | * [Program to print sum of 'n' prime numbers](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/44.c)
 54 | * [Program to swap two numbers without using third variable](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/47.c)
 55 | * [Program to swap two numbers using bitwise XOR](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/48.c)
 56 | * [Program to swap two numbers using pointer](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/49.c)
 57 | * [Program to add two numbers using pointer](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/50.c)
 58 | * [Program to add first and last digit of a number](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/51.c)
 59 | * [Program to find area of triangle using Heron's formula](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/52.c)
 60 | * [Program to convert Binary to Decimal](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/53.c)
 61 | * [Program to convert Decimal numbers to Binary](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/54.c)
 62 | * [Program to check the leap year](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/56.c)
 63 | * [Program to find nCr & nPr](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/57.c)
 64 | * [Program to calculate the sum of even numbers from 1 to n](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/59.c)
 65 | * [Program to add two strings without using concat() function](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/61.c)
 66 | * [Program to check vowels in string](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/62.c)
 67 | * [Program to compare two strings](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/63.c)
 68 | * [Program to compare strings without using strcmp() function](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/64.c)
 69 | * [Program to convert string from uppercase to lowercase](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/65.c)
 70 | * [Program to copy char array / copy string](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/66.c)
 71 | * [Program to copy string without using strcpy() function](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/67.c)
 72 | * [Program to count frequency of characters in a string](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/68.c)
 73 | * [Program to count total number of uppercase and lowercase in a string](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/69.c)
 74 | * [Program to calculate the length of string](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/70.c)
 75 | * [Program to calculate the length of string without using strlen() function](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/71.c)
 76 | * [Program to check the palindrome of string](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/72.c)
 77 | * [Program to check the palindrome of word using array](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/73.c)
 78 | * [Program to remove white space in string](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Moderate/74.c)
 79 | 
 80 | **Hard**
 81 | 
 82 | * [Program to reverse the string](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Hard/75.c)
 83 | * [Program to reverse the string using pointer](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Hard/76.c)
 84 | * [Program to sort the strings](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Hard/77.c)
 85 | * [Program to swap two strings](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Hard/78.c)
 86 | * [Program to add two matrix](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Hard/79.c)
 87 | * [Program to arrange array numbers in ascending order](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Hard/80.c)
 88 | * [Program to check whether the matrix is sparse matrix or not](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Hard/81.c)
 89 | * [Program to delete an element from array](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Hard/82.c)
 90 | * [Program to delete given number from array](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Hard/83.c)
 91 | * [Program to calculate the determinant of 2×2 matrix](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Hard/84.c)
 92 | * [Program to calculate the determinant of 3×3 matrix](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Hard/85.c)
 93 | * [Program to find Largest and Smallest number in array](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Hard/86.c)
 94 | * [Program to reverse the array](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Hard/87.c)
 95 | * [Program to insert an element in array at particular position](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Hard/88.c)
 96 | * [Program to sort array using Insertion sort](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Hard/89.c)
 97 | * [Search an element in a sorted array using Binary Search](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Hard/90.c)
 98 | * [Given an integer array, write a function to reverse every set of  'k' numbers. Modify the same array without creating another array. Reverse the remaining elements even if it is less than 'k'. 
 99 | Example: 
100 | Input:  {2, 1 , 3 , 5 , 8 , 6 , 7 , 9}   and k = 3 
101 | Output:  {3 , 1 , 2 , 6 , 8 , 5 , 9 , 7}](https://github.com/Ratheshprabakar/C-Complete-practice/blob/master/Hard/94.c)
102 | 


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