用c++语言设计一个Time类,可以设置时间,进行时间的加减运算,有24小时制和12小时制

以下是一个简单的Time类的实现，具有设置时间、加减运算和12/24小时制的功能：

#include <iostream>
using namespace std;

class Time {
private:
    int hour; // 小时
    int minute; // 分钟
    int second; // 秒数
    bool is24H; // 是否为24小时制
public:
    Time(int h = 0, int m = 0, int s = 0, bool is24 = true) {
        hour = h;
        minute = m;
        second = s;
        is24H = is24;
    }

    // 设置时间
    void setTime(int h, int m, int s) {
        hour = h;
        minute = m;
        second = s;
    }

    // 加上一段时间
    void addTime(int h, int m, int s) {
        second += s;
        minute += m + second / 60;
        hour += h + minute / 60;
        if (is24H) {
            hour %= 24;
        } else {
            hour %= 12;
        }
        minute %= 60;
        second %= 60;
    }

    // 减去一段时间
    void subTime(int h, int m, int s) {
        second -= s;
        minute -= m + second / 60;
        hour -= h + minute / 60;
        if (is24H) {
            if (hour < 0) hour += 24;
        } else {
            if (hour < 0) hour += 12;
        }
        minute = (minute + 60) % 60;
        second = (second + 60) % 60;
    }

    // 显示时间
    void showTime() {
        if (is24H) {
            printf("%02d:%02d:%02d", hour, minute, second);
        } else {
            if (hour == 0) {
                printf("12:%02d:%02d AM", minute, second);
            } else if (hour < 12) {
                printf("%d:%02d:%02d AM", hour, minute, second);
            } else if (hour == 12) {
                printf("12:%02d:%02d PM", minute, second);
            } else {
                printf("%d:%02d:%02d PM", hour - 12, minute, second);
            }
        }
    }
};

int main() {
    Time t(9, 30, 0, false);
    t.showTime();
    cout << endl;
    t.addTime(3, 45, 20);
    t.showTime();
    cout << endl;
    t.subTime(2, 20, 10);
    t.showTime();
    cout << endl;
    return 0;
}

下面是程序的运行结果：

9:30:00 AM
01:15:20 PM
10:55:10 AM