UVa 10110 - Light more light solution

Problem link :  UVa 10110 - Light more light

Solution : 


#include<stdio.h>
#include<math.h>
int main()
{
    long long int n,a,i;
    while(scanf("%lld",&n)==1)
    {
        if(n==0)
            break;
        i=sqrt(n);
        a=i*i;
        if(a==n)
            printf("yes\n");
        else
            printf("no\n");
    }
    return 0;
}