happy_number.c

#include<stdio.h>
#include<math.h>
int main()
{
   int i,j,num,temp,sum=0;
   scanf("%d",&num);
   while(sum!=1&&sum!=4)
   {
       sum=0;
       while(num>0)
       {
           j=num%10;
           sum+=(j*j);
           num=num/10;
       }
       num=sum;
   }
   if(sum==1)
   printf("True");
   else
   printf("False");
}