├── README.md
└── happy no


/README.md:
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1 | # HAPPY-NUMBER
2 | A C program to check if a number is a "happy number" typically involves defining a function that repeatedly calculates the sum of the squares of the digits of the number until either the sum becomes 1 or the process loops endlessly without reaching 1. Here's a description of the steps involved:
3 | 


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/happy no:
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 1 | #include <stdio.h>
 2 | 
 3 | int main() {
 4 | int a,b,c,last=0,sum=0;
 5 | scanf("%d",&a);
 6 | c=a;
 7 | while(a>0){
 8 | a=a/10;
 9 | b=b+1;
10 | }
11 | for(int i=0;i<b;i++){
12 | last=c%10;
13 | last=last*last;
14 | sum=sum+last;
15 | c=c/10;
16 | }
17 | while(sum!=1){
18 | c=sum;
19 | sum=0;
20 | for(int i=0;i<b;i++){
21 | last=c%10;
22 | last=last*last;
23 | sum=sum+last;
24 | c=c/10;
25 | }
26 | printf("%d\n",sum);}
27 | if(sum==1){
28 | printf("happy");
29 | }
30 | else{
31 | printf("sad");
32 | }
33 | return 0;
34 | } 
35 | 


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