func_code_string: #include <bits/stdc++.h>   using namespace std;   int gcd(int a, int b) {     if (b == 0) return a;     return gcd(b, a % b);   }   int main() {     ios::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     int a, b, c, d;     cin >> a >> b >> c >> d;     if (a * d < c * b) {       int g = gcd(b * c - a * d, b * c);       cout << ((b * c - a * d) / g) <<  /  << (b * c / g) << endl;     } else {       int g = gcd(a * d - b * c, a * d);       cout << ((a * d - b * c) / g) <<  /  << (a * d / g) << endl;     }     return 0;   }   