例10.6 在例10.5程序的基礎(chǔ)上增加對后置自增運算符的重載。修改后的程序如下：
#include <iostream>
using namespace std;
class Time
{public:
Time( ){minute=0;sec=0;}
Time(int m,int s):minute(m),sec(s){}
Time operator++( );                              //聲明前置自增運算符“++”重載函數(shù)
Time operator++(int);                           //聲明后置自增運算符“++”重載函數(shù)
void display( ){cout<<minute<<″:″<<sec<<endl;}
private:
int minute;
int sec;
}; 

Time Time∷operator++( )                     //定義前置自增運算符“++”重載函數(shù)
{if(++sec>=60)
{sec-=60;
++minute;}
return *this;                              //返回自加后的當前對象
}

Time Time∷operator++(int)                  //定義后置自增運算符“++”重載函數(shù)
{Time temp(*this);
sec++;
if(sec>=60)
{sec-=60;
++minute;}
return temp;                                //返回的是自加前的對象
}

int main( )
{Time time1(34,59),time2;
cout<<″ time1 : ″;
time1.display( );
++time1;
cout<<″++time1: ″;
time1.display( );
time2=time1++;                             //將自加前的對象的值賦給time2
cout<<″time1++: ″;
time1.display( );
cout<<″ time2 :″;
time2.display( );                            //輸出time2對象的值
}