/*
 **************************************************************************
 * Program name : 039_Elapsed_time (Version 1.00)                         *
 * Author       : Duck Wong                                               *
 * Language     : C / C++                                                 *
 * Compiler     : Boodshed Dec-C++ compiler Ver 3.95                      *
 * Computer     : PII350                                                  *
 * O/S          : Windows 98                                              *
 **************************************************************************
 * Version 1.00 : 2000/06/03 - first version                              *
 **************************************************************************
 * Description  : (a) Input the size of the checkerboard pattern          *
 *                (b) Output the checkerboard pattern                     *
 *                (c) Try again ?                                         *
 **************************************************************************
*/
#include <iostream.h>
#include <stdlib.h>

void elapsed(int ArrivalHH, int ArrivalMM, int DepartureHH, int DepartureMM)
{
 int HH, MM, TotalMM;

 if (ArrivalHH>DepartureHH)                                          // Note (1)
   TotalMM = DepartureHH*60+DepartureMM+24*60-ArrivalHH*60-ArrivalMM;
 else
   if ((ArrivalHH=DepartureHH) && (ArrivalMM>=DepartureMM))
     TotalMM = DepartureHH*60+DepartureMM+24*60-ArrivalHH*60-ArrivalMM;
   else
     TotalMM = DepartureHH*60+DepartureMM-ArrivalHH*60-ArrivalMM;
 cout << TotalMM / 60 << " Hours and " << TotalMM % 60 << " Minutes";
}

int main()
{
 // part 1 : declaration
 int   ArrivalHH, DepartureHH, ArrivalMM, DepartureMM, ArrivalSS, DepartureSS;
 int   DifferentHH, DifferentMM, DifferentSS;
 char  Again;

 do {
     cout << "\n\tElapsed_time (Version 1.00)\n";
     // PART 2 : Input arrival and departure time
     do {
         cout << "\n\tPlease input the Arrival Time : "
              << "\n\t\tHour (0 - 23)   : ";
         cin  >> ArrivalHH;
        } while (ArrivalHH<0 || ArrivalHH>23);
     do {
         cout << "\t\tMinute (0 - 59) : ";
         cin  >> ArrivalMM;
        } while (ArrivalMM<0 || ArrivalMM>60);
     do {
         cout << "\n\tPlease input the Departure Time : "
              << "\n\t\tHour (0 - 23)   : ";
         cin  >> DepartureHH;
        } while (DepartureHH<0 || DepartureHH>23);
     do {
         cout << "\t\tMinute (0 - 59) : ";
         cin  >> DepartureMM;
        } while (DepartureMM<0 || DepartureMM>60);

     // part 3 : Calculate the elapsed time
     cout << "\n\tThe elapsed time was : ";
     elapsed(ArrivalHH,ArrivalMM,DepartureHH,DepartureMM);

     // part 4 : try another number ?
     cout << "\n\n\tTry another number (Y/N) : ";
     cin  >> Again;
     cout << "\n";
    } while (Again=='Y' || Again=='y');
 cout << "\n" << endl;

 system("PAUSE");
 return 0;
}

/* Note
   (1)
        Example (a) :

        Please input the Arrival Time :
                Hour (0 - 23)   : 18
                Minute (0 - 59) : 30
        Please input the Departure Time :
                Hour (0 - 23)   : 23
                Minute (0 - 59) : 45
        The elapsed time was : 0 Hours and 15 Minutes


        Example (b) :
        Please input the Arrival Time :
                Hour (0 - 23)   : 21
                Minute (0 - 59) : 26
        Please input the Departure Time :
                Hour (0 - 23)   : 2
                Minute (0 - 59) : 14
        The elapsed time was : 4 Hours and 48 Minutes
*/