Can someone explain to me why the answer for this code is error?

Question

#include <iostream>
using namespace std;
int main () {
double x=5, y=2 ;
int result ;
result = x % y ;
cout << result ;
return 0 ;
}

Answer 1

「ＨＡＰＰＹ ＴＯ ＨＥＬＰ」
Thanks for your help :)