C++运行符重载、友元函数

Complex.h

#pragma once
#include <iostream>

using namespace std;
//表示一个复数
class Complex
{
private:
    double x, y;
public:
    Complex();    //默认构造函数
    Complex(double x, double y); //构造函数重载
    Complex operator+(Complex & cmx) const; //'+'号运算符重载
    Complex operator-(Complex & cmx) const;    //'-'号运算符重载
    Complex operator*(Complex & cmx) const;    //'*'号运算符重载
    Complex operator/(Complex & cmx) const;    //'/'号运算符重载
    Complex operator~() const;    //'~'号运算符重载
    Complex operator*(double & n) const; //'*'号运算符重载
    friend Complex operator*(double & n, Complex & cmx); //友元函数,可用于表示[4.0*Complex类型]
    friend ostream & operator<<(ostream & os, Complex & cmx); //友元函数,可用于表示[cout << Complex类型]
~Complex();
};

 Complex.cpp

#include "Complex.h"



Complex::Complex()
{
}

Complex::Complex(double x, double y)
{
    this->x = x;
    this->y = y;
}

Complex Complex::operator+(Complex & cmx) const
{
    return Complex(x + cmx.x, y + cmx.y);
}

Complex Complex::operator-(Complex & cmx) const
{
    return Complex(x - cmx.x, y - cmx.y);
}

Complex Complex::operator*(Complex & cmx) const
{
    return Complex(x*cmx.x, y*cmx.y);
}

Complex Complex::operator/(Complex & cmx) const
{
    return Complex(x / cmx.x, y / cmx.y);
}

Complex Complex::operator~() const
{
    return Complex(x, -y);
}

Complex Complex::operator*(double & n) const
{
    return Complex(x*n, y*n);
}

Complex operator*(double & n, Complex & cmx)
{
    return cmx*n;
}

ostream & operator<<(ostream & os, Complex & cmx)
{
    os << cmx.x << "," << cmx.y << endl;
    return os;
}

Complex::~Complex()
{
}