func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int h1, m1, h2, m2, result1, result2;     char c =  : ;     while (cin >> h1 >> c >> m1 >> h2 >> c >> m2) {       if (m1 < m2) {         h1 -= 1;         m1 += 60;       }       result2 = m1 - m2;       result1 = h1 - h2;       if (result1 < 0) result1 += 24;       if (result1 == 24) result1 = 0;       cout << setw(2) << setfill( 0 ) << abs(result1) << c << setw(2)            << setfill( 0 ) << abs(result2) << endl;     }     return 0;   }   