C++运算符重载小程序

// chongzai.cpp : 定义控制台应用程序的入口点。
//运算符重载+ -     友原函数的运用

#include "stdafx.h"

#include <iostream>
using namespace std;
class Complex
{
public:
 Complex( ) {real=0;
             image=0;}
 Complex (double r,double i);

 Complex operator+ (Complex &c5);//重载加法声明(复数与复数相加) 对象
 friend Complex operator+ (double &,Complex &);//重载加法声明(整数与复数相加) 对象
    friend Complex operator+ (Complex &c5,double &a);//重载加法声明(复数与整数相加) 对象
 friend Complex operator- (Complex &c5,double &a);//重载加法声明(复数与整数相减) 对象
 friend Complex operator- (double &a,Complex &c5);//重载加法声明(整数与复数相减) 对象
 Complex operator- (Complex &c5);//重载减法声明 (复数与复数相减) 对象
 void display();//声明输出函数
 

private:
 double  real;
 double  image;
};

 Complex Complex::operator + (Complex &c5)//定义重载加法运算符 (复数与复数相加) 成员函数
{
 
 return Complex(real+c5.real,image+c5.image);
}
Complex Complex::operator - (Complex &c5)//定义重载减法运算符  (复数与复数相减) 成员函数
{
 Complex c;
 c.real=real-c5.real;
 c.image=image-c5.image;
 return c;
}
 Complex operator+ (double &a,Complex &ca)//定义重载加法(整数与复数相加) 对象
{
 
 return Complex(a+ca.real,ca.image);
}
Complex operator+ (Complex &c5,double &a)//定义重载加法(复数与整数相加) 对象
{
 
 return Complex(c5.real+a,c5.image);
}
Complex operator- (Complex &c5,double &a)//定义重载加法(复数与整数相减) 对象
{
 return Complex(c5.real-a,c5.image);
}

Complex operator- (double &a,Complex &c5)//定义重载加法(复数与整数相减) 对象
{
 
 return Complex(a-c5.real,c5.image);
}

Complex::Complex(double r,double i)//重载构造函数
{
             real=r;
             image=i;
}

void Complex::display ()
{
 cout <<"("<<real<<","<<image<<")"<<endl;
}
int main ()
{
Complex c1(3,2),c2(1,2),c3,c4,c7,c8;
double m=2;
c3=c1+c2;

c3.display();
c4=c3-c1;
c4.display();
c7=m+c1;
c7.display();
c8=m-c3;
c8.display();
return 0;
}