运算符<<重载

/*
* 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);
	friend ostream& operator<<(ostream&,Complex&);
	friend istream& operator>>(istream&,Complex&);
 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
}
ostream& operator<<(ostream&output,Complex&c)
{
    output<<"("<<c.real<<","<<c.imag<<"i)"<<endl;
    return output;
}
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);
}


//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;
	cout<<"c2="<<c2;
	c3=c1+c2;
	cout<<"c1+c2="<<c3;
	c3=c1-c2;
	cout<<"c1-c2="<<c3;
	c3=c1*c2;
	cout<<"c1*c2="<<c3;
	c3=c1/c2;
	cout<<"c1/c2="<<c3;
	return 0;
}

输出结果：