Calculating the difference of two times in C++ -


one of problems i'm working on requires input of 2 time values (being in hours, minutes , seconds)in 24h00 format. have declared variables, input , output statements regards main program. i'm having trouble void statement calcdiff calculate difference of 2 time inputs. values have been declared of type int. should inputs(eg. sec , sec2) compared first see greater before calculating difference? i'm assuming order of variables important too(calculating difference of hours before minutes, before seconds)? i'm new c++ apologies if i'm missing obvious. 

    // computes time difference of 2 time periods in 24h00 format     // time periods input      #include <iostream>     using namespace std;      int seconds,seconds2, minutes, minutes2, hours, hours2;       void calcdiff(int seconds, int seconds2 int minutes, int minutes2, int      hours, int hours2);      int main()     {         int sec, sec2, min, min2, hr, hr2, diff;          cout << "enter first time." << endl;         cout << "enter hours, minutes , seconds: ";         cin >> hr >> min >> sec;          cout << "enter second time." << endl;         cout << "enter hours, minutes , seconds: ";         cin >> hr2 >> min2 >> sec2;          calcdiff(int sec, int sec2, int min, int min2, int hr, int hr2,          diff);          cout << endl << "difference in times: " << hr << ":" << min << ":"          << sec;         cout << " - " << hr2 << ":" << min2 << ":" << sec2;      return 0;     }     void calcdiff(int seconds, int seconds2, int minutes, int minutes2, int      hour, int hour2, diff)

use <chrono> plus an existing library.

#include "date.h" #include <iostream>  int main() {     std::chrono::seconds t1, t2;     std::cout << "enter first time [h]h:mm:ss: ";     std::cin >> date::parse("%t", t1);     if (std::cin.fail())         return 1;     std::cout << "enter second time [h]h:mm:ss: ";     std::cin >> date::parse(" %t", t2);     if (std::cin.fail())         return 1;     std::cout << date::format("difference in times: %t\n", t1 - t2); }

the above library free, open-source, , being proposed standardization.


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