C++拷贝构造函数以及运算符重载例子 （Linux 下编

这里定义一个复数的类，并演示了它的用法

复数类 COMPLEX 的定义头文件：complex.h
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class COMPLEX
{
public:
        COMPLEX(double r=0, double i=0);                      //默认构造函数
        COMPLEX(const COMPLEX &other);                   //拷贝构造函数
        ~COMPLEX();                                                       //析构函数
        void print();                                                            //打印复数
        COMPLEX operator +(const COMPLEX &other); //重载加法运算符（二元）
        COMPLEX operator -(const COMPLEX &other);   //重载减法运算符（二元）
        COMPLEX operator -( );                                        //重载求负运算符（一元）
        COMPLEX operator =(const COMPLEX &other); //重载赋值运算符（二元）
protected:
        double real;                                                           //复数的实部
        double image;                                                       //复数的虚部
};
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复数类 COMPLEX 的实现文件：complex.cpp
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#include <iostream>
#include "complex.h"
using namespace std;

//默认构造函数
COMPLEX::COMPLEX(double r, double i)
{
        real = r;
        image = i;
        cout<<"Default Constructing real: "<<r<<", image: "<<i<<" .\n";
        return;
}

//拷贝构造函数
COMPLEX::COMPLEX(const COMPLEX &other)
{
        real = other.real;
        image = other.image;
        cout<<"Copy Constructing real: "<<other.real<<", image: "<<other.image<<" .\n";
        return;
}

//析构函数
COMPLEX::~COMPLEX()
{
        cout<<"Destructing real: "<<real<<", image: "<<image<<" .\n";
        return;
}

//打印复数
void COMPLEX::print()
{
        cout<<real;
        if (image > 0)
        {
                cout<<"+"<<image<<"i";
        }
        else if (image < 0)
        {
                cout<<image<<"i";
        }
        cout<<"\n";
        return;
}

//重载加法运算符（二元）
COMPLEX COMPLEX::operator +(const COMPLEX &other)
{
        COMPLEX temp;