c++运算符重载电子时钟

以下是一个简单的电子时钟类，包含了重载运算符来实现时钟的加、减、比较等操作：

#include <iostream>
#include <iomanip>

using namespace std;

class Clock {
public:
    Clock(int h = 0, int m = 0, int s = 0) : hour(h), minute(m), second(s) {}
    void setTime(int h, int m, int s) { hour = h; minute = m; second = s; }
    void showTime() const { cout << setfill('0') << setw(2) << hour << ':' << setw(2) << minute << ':' << setw(2) << second << endl; }
    Clock operator+(int seconds) const;
    Clock operator-(int seconds) const;
    int operator-(const Clock& c) const;
    bool operator<(const Clock& c) const;
    bool operator>(const Clock& c) const;
    bool operator==(const Clock& c) const;
private:
    int hour, minute, second;
};

Clock Clock::operator+(int seconds) const {
    Clock tmp(hour, minute, second + seconds);
    if (tmp.second >= 60) {
        tmp.second -= 60;
        tmp.minute++;
    }
    if (tmp.minute >= 60) {
        tmp.minute -= 60;
        tmp.hour++;
    }
    tmp.hour %= 24;
    return tmp;
}

Clock Clock::operator-(int seconds) const {
    Clock tmp(hour, minute, second - seconds);
    if (tmp.second < 0) {
        tmp.second += 60;
        tmp.minute--;
    }
    if (tmp.minute < 0) {
        tmp.minute += 60;
        tmp.hour--;
    }
    tmp.hour = (tmp.hour + 24) % 24;
    return tmp;
}

int Clock::operator-(const Clock& c) const {
    int t1 = hour * 3600 + minute * 60 + second;
    int t2 = c.hour * 3600 + c.minute * 60 + c.second;
    return (t1 - t2 + 86400) % 86400;
}

bool Clock::operator<(const Clock& c) const {
    return (hour < c.hour || (hour == c.hour && (minute < c.minute || (minute == c.minute && second < c.second))));
}

bool Clock::operator>(const Clock& c) const {
    return (hour > c.hour || (hour == c.hour && (minute > c.minute || (minute == c.minute && second > c.second))));
}

bool Clock::operator==(const Clock& c) const {
    return (hour == c.hour && minute == c.minute && second == c.second);
}

int main() {
    Clock c1(12, 0, 0), c2(0, 0, 0);
    c1.showTime();
    c2.showTime();
    Clock c3 = c1 + 3600;
    c3.showTime();
    c3 = c3 - 1800;
    c3.showTime();
    cout << "c1 - c2 = " << c1 - c2 << endl;
    cout << "c2 - c1 = " << c2 - c1 << endl;
    cout << "c1 < c2: " << (c1 < c2) << endl;
    cout << "c1 > c2: " << (c1 > c2) << endl;
    cout << "c1 == c2: " << (c1 == c2) << endl;
    cout << "c1 == c3: " << (c1 == c3) << endl;
    return 0;
}

在该类中，我们重载了加、减、比较等运算符，使得可以直接对时钟对象进行加减、比较等操作。其中，加减运算的实现需要注意进位和借位的情况，而比较运算则需要按照小时、分钟、秒钟的顺序进行比较。