例10.5 有一個(gè)Time類，包含數(shù)據(jù)成員minute(分)和sec(秒)，模擬秒表，每次走一秒，滿60秒進(jìn)一分鐘，此時(shí)秒又從0開始算。要求輸出分和秒的值。
#include <iostream>
using namespace std;
class Time
{public:
Time( ){minute=0;sec=0;}                                //默認(rèn)構(gòu)造函數(shù)
Time(int m,int s):minute(m),sec(s){ }                   //構(gòu)造函數(shù)重載
Time operator++( );                                     //聲明運(yùn)算符重載函數(shù)
void display( ){cout<<minute<<″:″<<sec<<endl;}          //定義輸出時(shí)間函數(shù)
private:
int minute;
int sec;
};
Time Time∷operator++( )                       //定義運(yùn)算符重載函數(shù)
{if(++sec>=60)
{sec-=60;                                  //滿60秒進(jìn)1分鐘
++minute;}
return *this;                             //返回當(dāng)前對(duì)象值
}   
int main( )
{Time time1(34,0);
for (int i=0;i<61;i++)
{++time1;
time1.display( );}
return 0;
}