93 lines
1.8 KiB
C++
93 lines
1.8 KiB
C++
#include<iostream>
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#include<cmath>
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using namespace std;
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/*
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* 时钟类
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*/
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class Clock
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{
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private:
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int Hour, Minute, Second;
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public:
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Clock(int h=0, int m=0, int s=0);
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void ShowTime();
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Clock& operator ++();
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Clock operator ++(int);
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};
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/*
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* 时钟类构造函数
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*/
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Clock::Clock(int h,int m, int s)
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{
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if(h>=0 && h<24 && m>=0 && m<60 && s>=0 && s<60)
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{
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Hour = h;
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Minute =m;
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Second= s;
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}
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else
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cout<<"输入的时间格式错误!"<<endl;
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}
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/*
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* 显示时间
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*/
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void Clock::ShowTime()
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{
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cout<<Hour<<":"<<Minute<<":"<<Second<<endl;
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}
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/*
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* 时间递增一秒（重载前缀++运算符）
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*/
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Clock& Clock::operator ++()
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{
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Second++;
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if (Second >= 60)
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{
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Second = Second - 60;
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Minute++;
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if (Minute >= 60)
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{
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Minute = Minute - 60;
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Hour++;
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Hour = Hour % 24;
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}
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}
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return *this;
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}
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/*
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* 时间递增一秒（重载后缀++运算符）
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*/
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Clock Clock::operator ++(int)
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{
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Clock old = *this;
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++(*this);
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return old;
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}
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/*
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* 主函数
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*/
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int main()
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{
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Clock myClock(23,59,59);
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cout<<"初始化显示时间为:\t\t";
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myClock.ShowTime();
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cout<<"执行myClock++后的时间为:\t";
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//先执行ShowTime()，输出myClock=23:59:59，
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//再执行myClock++，此时myClock=00:00:00
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(myClock++).ShowTime();
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cout<<"执行++myClock后的时间为:\t";
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//先执行++myClock，此时myClock=00:00:01
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//再执行ShowTime()，输出myClock=00:00:01
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(++myClock).ShowTime();
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system("pause");
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}
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