怎么判断小数是无限小数还是有线小数？

Question

#include<stdio.h>
int main()
{
    int T;
    scanf("%d", &T);
    while (T--)
    {
        int n;
        scanf("%d", &n);
        if (((1.0/n)*n-1)<1e-5)
        {
            printf("YES\n");
        }
        else
        {
            printf("NO\n");
        }
    }
    return 0;
}

Answer 1

double r=1.0/n;
if(r*n==1) printf("YES\n");
else printf("NO\n");