处理虚数类 运算符的重载 友元函数

/*
* 程序的版权和版本声明部分
* Copyright (c)2012, 烟台大学计算机学院学生
* All rightsreserved.
* 文件名称： object.cpp
* 作者：王飞
* 完成日期：2013 年4月 19日
* 版本号： v1.0
* 输入描述：无
* 问题描述：处理虚数类
* 程序输出：如下
*/

#include <iostream>

using namespace std;

class Complex           //声明类Complex
{public:
Complex(){real=0;imag=0;}
Complex(double r,double i){real=r;imag=i;}
friend Complex operator+(Complex &c1,Complex &c2);
friend Complex operator-(Complex &c1,Complex &c2);
friend Complex operator*(Complex &c1,Complex &c2);  //友元函数
friend Complex operator/(Complex &c1,Complex &c2);
void display();
private:
double real;            //实部
double imag;               //虚部
};
//下面定义成员函数
Complex operator+(Complex &c1,Complex &c2)
{
return Complex (c1.real+c2.real,c1.imag+c2.imag);   //注意返回的类型
}

Complex operator-(Complex &c1,Complex &c2)
{
return Complex (c1.real-c2.real,c1.imag-c2.imag);
}

Complex operator*(Complex &c1,Complex &c2)
{
return Complex (c1.real*c2.real,c1.imag*c2.imag);
}

Complex operator/(Complex &c1,Complex &c2)
{
return Complex (c1.real/c2.real,c1.imag/c2.imag);
}

void Complex::display()
{
cout<<"("<<real<<","<<imag<<"i)"<<endl;
}
//下面定义用于测试的main()函数
int main()
{
Complex c1(3,4),c2(5,-10),c3;
cout<<"c1=";
c1.display();
cout<<"c2=";
c2.display();
c3=c1+c2;
cout<<"c1+c2=";
c3.display();
c3=c1-c2;
cout<<"c1-c2=";
c3.display();
c3=c1*c2;
cout<<"c1*c2=";
c3.display();
c3=c1/c2;
cout<<"c1/c2=";
c3.display();
return 0;
}