├── Pattern
└── calculator sum


/Pattern:
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 1 | import java.util.*;
 2 | public class Main
 3 | {
 4 | 	public static void main(String[] args) {
 5 | 		Scanner sc=new Scanner(System.in);
 6 | 		 int n=sc.nextInt();
 7 | 		 for(int i=1;i<=n;i++)
 8 | 		 {
 9 | 		     for(int j=1;j<=n;j++)
10 | 		     {
11 | 		         if(i+j>n){
12 | 		         System.out.print("* ");
13 | 		         }
14 | 		     else{
15 | 		         System.out.print(" ");
16 | 		     } 
17 | 		     }
18 | 		 System.out.println();
19 | 		     
20 | 		 }
21 | 		  for(int i=n;i>=1;i--)
22 | 		 {
23 | 		     for(int j=1;j<=n;j++)
24 | 		     {
25 | 		         if(i+j>n){
26 | 		         System.out.print("* ");
27 | 		         }
28 | 		     else{
29 | 		         System.out.print(" ");
30 | 		     } 
31 | 		     }
32 | 		 System.out.println();
33 | 		 
34 | 	}
35 | 
36 | }
37 | }
38 | 


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/calculator sum:
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 1 | import java.util.*;
 2 | import java.lang.Math;
 3 | public class Main{
 4 |     public static void main(String[]args){
 5 |          Scanner sc=new Scanner(System.in);
 6 |            boolean boon=true;
 7 |             while(boon){
 8 |          System.out.print("Enter the value of a:");
 9 |          int a=sc.nextInt();
10 |          System.out.print("Enter the value of b:");
11 |          int b=sc.nextInt();
12 | 
13 |          System.out.println("1.Addition\n2.Subtraction\n3.Multiplication\n4.Division\n5.Modulus\n6.Square root\n7.Cube root\n8.Power");
14 |          System.out.print("Enter your choice:");
15 |          int n=sc.nextInt();
16 |        
17 |      
18 |          switch(n)
19 |          {
20 |              case 1:
21 |                 System.out.println(a+b);
22 |                 break;
23 |             case 2:
24 |                 System.out.println(a-b);
25 |                 break;
26 |             case 3:
27 |                 System.out.println(a*b);
28 |                 break;
29 |             case 4:
30 |                 System.out.println(a/b);
31 |                 break;
32 |             case 5:
33 |                 System.out.println(a%b);
34 |                 break;
35 |             case 6:
36 |                 System.out.println(Math.sqrt(a));
37 |                 System.out.println(Math.sqrt(b));
38 |             case 7:
39 |                 System.out.println(Math.cbrt(a));
40 |                 System.out.println(Math.cbrt(b));
41 |             case 8:
42 |                 System.out.println(Math.pow(a,b));
43 |                 break;
44 |          }
45 |          System.out.println("Do you want to continue?? 0 or 1");
46 |          int x=sc.nextInt();
47 |          if(x==0){
48 |              boon=false;
49 |          }
50 |          else{
51 |              boon=true;
52 |          }
53 |          }
54 |     }
55 | }
56 | 


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