85 lines
1.5 KiB
C++
85 lines
1.5 KiB
C++
/* 时钟++运算符重载.cpp */
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#include <cmath>
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#include <iostream>
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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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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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if (h >= 0 && h < 24 && m >= 0 && m < 60 && s >= 0 && s < 60) {
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Hour = h;
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Minute = m;
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Second = s;
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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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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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Second++;
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if (Second >= 60) {
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Second = Second - 60;
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Minute++;
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if (Minute >= 60) {
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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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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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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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} |