Problem

#include <stdio.h>

int main()
{
    double x,y,T, sum,z,n=2;
    scanf("%lf", &T);
    while(T>0){
        T--;
        scanf("%lf %lf", &x, &y);
        z=sum-(x+y);
        for(n<=sum ; n++;){
        while(sum%sum==0 && sum/1==sum && sum%n !=0){
                printf("%lf", z);
        }
        }

    }
    return 0;
}