1076C - Meme Problem ~~~~~

include<stdio.h>

include<math.h>

int main(){

int a,t,i;

double y,z;

scanf("%d",&t);

for(i = 0; i < t; i++){

    scanf("%d",&a);

    if(a == 1 || a==2 || a==3){

        printf("N\n");
    }
    else{
        y = ((double)a + sqrt((double)a*(double)a - 4*(double)a))/2;

        z = ((double)a - sqrt((double)a*(double)a - 4*(double)a))/2;

        printf("Y %0.9lf %0.9lf\n",y,z);
    }
}
return 0;

} ~~~~~

gets AC in GNU C++11 but gets WA in C. though I wrote it in C syntax. how?