//
// Program:  secondsToHMS.
//
// Purpose:  Convert seconds to hours, minutes, seconds.
//   (Also, illustrate pass-by-reference parameters.)
//
// Input:  number of seconds N (non-negative integer).
// Output:  hours, minutes, and seconds in N.
//

#include <iostream.h>
#include <stdlib.h>		// has EXIT_SUCCESS, EXIT_FAILURE

// Pre:  N >= 0.
// Post:  S seconds, M minutes, H hours = N seconds.
void secondsToHMS(int N, int & H, int & M, int & S)
  {
    H = N / (60*60);
    M = (N / 60) % 60;
    S = N % 60;
    return;
  }

// Main program.
int main(void)
{
  int sec;
  int hh, mm, ss;
  cout << "Enter a non-negative number of seconds:\n";
  cin >> sec;
  if (sec < 0)
    {
      cout << "Error:  Number must be non-negative.\n";
      exit(EXIT_FAILURE);
    }
  secondsToHMS(sec, hh, mm, ss);
  cout << sec << " seconds = "
       << hh << " hours, "
       << mm << " minutes, "
       << ss << " seconds.\n";
  return EXIT_SUCCESS;
}