Time.h

//
//  Time.h
//  运算符重载1-23期92子羽
//
//  Created by 墨狂之逸才 on 2018/6/11.
//  Copyright © 2018年 墨狂之逸才. All rights reserved.
//
#pragma once
#include<iostream>
using namespace std;

class Time {
public:
    Time();
    ~Time();
    Time(int hour,int minute,int second);
    Time operator+(const Time &time);
    Time operator+=(const Time &time);
    Time operator-(const Time &time);
    void show();
private:
    int m_hour;
    int m_minute;
    int m_second;
};

Time.cpp

//
//  Time.cpp
//  运算符重载1-23期92子羽
//
//  Created by 墨狂之逸才 on 2018/6/11.
//  Copyright © 2018年 墨狂之逸才. All rights reserved.
//

#include "Time.h"
using namespace std;

Time::Time(){
    
}

Time::Time(int hour,int minute,int second){
    this->m_hour = hour;
    this->m_minute = minute;
    this->m_second = second;
}

Time::~Time(){
    
}
//重载为成员函数格式
Time Time::operator+(const Time &time){
    int temp = 0;
    Time resultTime;
    if ((this->m_second + time.m_second) < 60) {
        resultTime.m_second = this->m_second + time.m_second;
        temp = 0;
    } else {
        resultTime.m_second = (this->m_second + time.m_second) % 60;
        temp = 1;
    }
    
    if ((this->m_minute + time.m_minute + temp) < 60) {
        resultTime.m_minute =this->m_minute + time.m_minute + temp;
        temp = 0;
    } else {
        resultTime.m_minute = (this->m_minute + time.m_minute + temp) % 60;
        temp = 1;
    }
    
    if ((this->m_hour + time.m_hour + temp) < 24) {
        resultTime.m_hour = this->m_hour + time.m_hour + temp;
        temp = 0;
    }else {
        resultTime.m_hour = (this->m_hour + time.m_hour + temp) % 24;
        temp = 1;
    }
    return resultTime;
}

Time Time::operator+=(const Time &time){
    int temp = 0;
    if ((this->m_second + time.m_second) < 60) {
        this->m_second += time.m_second;
        temp = 0;
    } else {
        this->m_second = (this->m_second + time.m_second) % 60;
        temp = 1;
    }
    
    if ((this->m_minute + time.m_minute + temp) < 60) {
        this->m_minute =this->m_minute + time.m_minute + temp;
        temp = 0;
    } else {
        this->m_minute = (this->m_minute + time.m_minute + temp) % 60;
        temp = 1;
    }
    
    if ((this->m_hour + time.m_hour + temp) < 24) {
        this->m_hour = this->m_hour + time.m_hour + temp;
        temp = 0;
    }else {
        this->m_hour = (this->m_hour + time.m_hour + temp) % 24;
        temp = 1;
    }
    return *this;
}

//重载为成员函数格式
Time Time::operator-(const Time &time){
    int temp = 0;
    Time resultTime;
    if (this->m_second > time.m_second) {
        resultTime.m_second = this->m_second - time.m_second;
        temp = 0;
    } else {
        temp = 1;
        resultTime.m_second = this->m_second + 60 - time.m_second;//借位
    }
    
    if ((this->m_minute - temp - time.m_minute) > 0) {
        resultTime.m_minute = this->m_minute - time.m_minute -temp;
        temp = 0;
    } else {
        temp = 1;
        resultTime.m_minute = this->m_minute + 60 - time.m_minute;//借位
    }
    
    if ((this->m_hour - temp - time.m_hour) > 0) {
        resultTime.m_hour = this->m_hour - time.m_hour -temp;
        temp = 0;
    } else {
        resultTime.m_hour = this->m_hour + 24 - time.m_hour - temp;
        temp = 1;
    }
    return resultTime;
}

void Time::show(){
    cout << "北京时间：" << m_hour << "时" << m_minute << "分" << m_second <<  "秒" << endl;
}

main.cpp

//
//  main.cpp
//  运算符重载1-23期92子羽
//
//  Created by 墨狂之逸才 on 2018/6/11.
//  Copyright © 2018年 墨狂之逸才. All rights reserved.
//

#include <iostream>
#include "Time.h"

int main(int argc, const char * argv[]) {

    Time t1(17,17,17);
    Time t2(0,0,1);
    
    Time t3 = t1 + t2;
    t1.show();
    t2.show();
    t3.show();
    
    cout << "===================" << endl;
    
    t1.show();
    t1 += t2;
    t1.show();
    t2.show();
    
    
    return 0;
}

运算结果：

北京时间：17时17分17秒
北京时间：0时0分1秒
北京时间：17时17分18秒
===================
北京时间：17时17分17秒
北京时间：17时17分18秒
北京时间：0时0分1秒
Program ended with exit code: 0