C++笔记7（重载运算符代码）

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前言

最近学习了重载运算符的相关知识。用法和定义其他大佬已经做了详细的解释，本人不再过多赘述。这篇博客主要用来展示关于重载运算符的一个小小小项目。

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头文件

#pragma once
#ifndef cpp_second_hpp
#define cpp_second_hpp

#include <stdio.h>
#include <iostream>
using namespace std;

class Box{
public:
    double getVolume(void);
    
    void setLength(double len);
    
    void setBreadth(double bre);
    
    void setHeight(double hei);
    
    //重载运算符，把两个Box对象相加
    Box();
    Box(const Box& box);
    
    Box operator=(const Box& box);
    
    bool operator==(const Box& box);
    
    Box operator-(const Box& box);
    
    Box operator++();
    
    Box operator++(int);
    
private:
    double length;
    double breath;
    double height;
};
#endif

cpp文件

#include "cpp_second.hpp"
#include<iostream>
using namespace std;

double Box::getVolume(void) {
    return length * height * breath;
}

void Box::setHeight(double hei) {
    height = hei;
}

void Box::setBreadth(double bre) {
    breath = bre;
}

void Box::setLength(double len) {
    length = len;
}

Box::Box() = default;
Box::Box(const Box& box) {
    this->height = box.height;
    this->breath = box.breath;
    this->length = box.length;
}

Box Box::operator=(const Box& b) {
    length = b.length;
    height = b.height;
    breath = b.breath;
    return *this;
}

bool Box::operator==(const Box& b) {
    if(length == b.length && breath == b.breath && height == b.height){
        return true;
    }
    return false;
}

Box Box::operator-(const Box& b){
    length = length - b.length;
    height = height - b.height;
    breath = breath - b.breath;
    return *this;
}

Box Box::operator++() {
    ++length;
    ++height;
    ++breath;
    return *this;
}

Box Box::operator++(int) {
    Box temp = *this;
    length++;
    height++;
    breath++;
    return temp;
}
int main() {
    Box box1;
    box1.setLength(8);
    box1.setHeight(5);
    box1.setBreadth(3);

    Box box2;
    box2 = box1;

    Box box3;
    box3.setLength(1);
    box3.setHeight(1);
    box3.setBreadth(1);

    box2 - box3;
    box1++;
    ++box1;
    if (box1 == box2) {
        cout << box2.getVolume() << endl;
    }
    cout << box1.getVolume() << endl;
    
    return 0;
}