func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int a, b, c, d;     cin >> a >> b >> c >> d;     int x, y, i;     if (b * c > a * d) {       x = b * c - a * d;       y = b * c;     } else {       x = a * d - b * c;       y = a * d;     }     while (1) {       int k = 0;       for (i = 2; i <= x; i++) {         if (x % i == 0 && y % i == 0) {           x = x / i;           y = y / i;           k++;         }       }       if (k == 0) break;     }     if (x == 0)       cout << x <<  /             <<  1 ;     else       cout << x <<  /  << y;     return 0;   }   