time4.cpp

《c＋＋大学教程》源码

// Fig. 6.22: time4.cpp
// Member-function definitions for Time class.

// include definition of class Time from time4.h
#include "time4.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 ); 

} // end Time constructor

// set 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;

} // end function setTime

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

} // end function getHour

// 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

} // end function badSetHour

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