C++的时钟类

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#include <iostream>using namespace std;class Clock{private:int hour, minute, second;public:Clock(int hour = 0, int minute = 0, int second = 0);Clock & operator++();Clock operator++(int);friend ostream & operator<<(ostream & output, const Clock & obj);};Clock::Clock(int hour, int minute, int second) :hour(hour), minute(minute), second(second){}Clock & Clock::operator++(){second++;if (second >= 60){minute += second / 60;second %= 60;if (minute >= 60){hour += minute / 60;minute %= 60;if (hour >= 24)hour %= 24;}}return (*this);}Clock Clock::operator++(int){Clock old = (*this);  //将原来的对象拷贝一份++(*this);<span style="white-space:pre"></span>      //<span style="color: rgb(51, 51, 51); font-family: Helvetica, Tahoma, Arial, sans-serif; font-size: 14px; line-height: 24px; background-color: rgb(245, 245, 245);">然后调用重载的前置操作符因为*this的对象类型是Clock</span>return (old);}ostream & operator<<(ostream & output, const Clock & obj){output << obj.hour << ":" << obj.minute << ":" << obj.second;return (output);}int main(){Clock myClock(23, 59, 59);cout << "myClock: " << myClock << endl;cout << "myClock++: " << myClock++ << endl;cout << "myClock: " << myClock << endl;cout << "++myClock: " << ++myClock << endl;cout << "myClock++: " << myClock++ << endl;cout << "myClock: " << myClock << endl;return (0);}
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