fig06_20.cpp

《c＋＋大学教程》源码

// Fig. 6.20: fig06_20.cpp
// Demonstrating the Time class set and get functions
#include <iostream>

using std::cout;
using std::endl;

// include definition of class Time from time3.h
#include "time3.h"

void incrementMinutes( Time &, const int );  // prototype

int main()
{
   Time t;              // create Time object

   // set time using individual set functions
   t.setHour( 17 );     // set hour to valid value
   t.setMinute( 34 );   // set minute to valid value
   t.setSecond( 25 );   // set second to valid value

   // use get functions to obtain hour, miunute and second
   cout << "Result of setting all valid values:\n" 
        << "  Hour: " << t.getHour()
        << "  Minute: " << t.getMinute()
        << "  Second: " << t.getSecond();

   // set time using individual set functions
   t.setHour( 234 );    // invalid hour set to 0
   t.setMinute( 43 );   // set minute to valid value
   t.setSecond( 6373 ); // invalid second set to 0

   // display hour, minute and second after setting 
   // invalid hour and second values
   cout << "\n\nResult of attempting to set invalid hour and"
        << " second:\n  Hour: " << t.getHour()
        << "  Minute: " << t.getMinute()
        << "  Second: " << t.getSecond() << "\n\n";

   t.setTime( 11, 58, 0 );    // set time
   incrementMinutes( t, 3 );  // increment t's minute by 3

   return 0;

} // end main

// add specified number of minutes to a Time object
void incrementMinutes( Time &tt, const int count )
{
   cout << "Incrementing minute " << count
        << " times:\nStart time: ";
   tt.printStandard();

   for ( int i = 0; i < count; i++ ) {
      tt.setMinute( ( tt.getMinute() + 1 ) % 60 );  

      if ( tt.getMinute() == 0 )
         tt.setHour( ( tt.getHour() + 1 ) % 24 );

      cout << "\nminute + 1: ";
      tt.printStandard();

   } // end for

   cout << endl;

} // end function incrementMinutes

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