time4.cpp

c++大学教程配套光盘（第二版） 课程后习题

// Fig. 6.11: time4.cpp
// Member function definitions for Time class.
#include "time4.h"
#include <iostream.h>

// Constructor function to initialize private data.
// Calls member function setTime to set variables.
// Default values are 0 (see class definition).
Time::Time( int hr, int min, int sec ) 
   { setTime( hr, min, sec ); }

// Set the values of hour, minute, and second.
void Time::setTime( int h, int m, int s )
{
   hour   = ( h >= 0 && h < 24 ) ? h : 0;
   minute = ( m >= 0 && m < 60 ) ? m : 0;
   second = ( s >= 0 && s < 60 ) ? s : 0;
}

// Get the hour value
int Time::getHour() { return hour; }

// POOR PROGRAMMING PRACTICE:
// Returning a reference to a private data member.
int &Time::badSetHour( int hh )
{
   hour = ( hh >= 0 && hh < 24 ) ? hh : 0;

   return hour;  // DANGEROUS reference return
}