输出运算符重载

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/** 程序的版权和版本声明部分:* Copyright (c) 2013, 烟台大学计算机学院* All rights reserved.* 文件名称：test.cpp* 作    者：任子仪* 完成日期：2014年 4月 22日* 版 本 号：v12.1* 输入描述：无* 问题描述：。* 程序输出：* 问题分析：略* 算法设计：略*/#include<iostream>using namespace std;class Complex{public:    Complex()    {        real=0;        imag=0;    }    Complex(double r,double i)    {        real=r;        imag=i;    }    //二目运算符重载    Complex operator+(Complex &c2);    Complex operator-(Complex &c2);    Complex operator*(Complex &c2);    Complex operator/(Complex &c2);    //一目运算符重载    Complex operator-();    friend ostream& operator << (ostream&,Complex&);private:    double real;    double imag;};ostream& operator << (ostream& output,Complex& c){    if(c.imag>0)    output<<c.real<<"+"<<c.imag<<"i"<<endl;    else    output<<c.real<<c.imag<<"i"<<endl;    return output;}//下面定义成员函数Complex Complex::operator+(Complex &c2){    return Complex(real+c2.real,imag+c2.imag);}Complex Complex::operator-(Complex &c2){    return Complex(real-c2.real,imag-c2.imag);}Complex Complex::operator*(Complex &c2){    Complex c;    c.real=real*c2.real-imag*c2.imag;    c.imag=real*c2.imag+imag*c2.real;    return c;}Complex Complex::operator/(Complex &c2){    Complex c;    double d=c2.real*c2.real+c2.imag*c2.imag;    c.real=(real*c2.real+imag*c2.imag)/d;    c.imag=(imag*c2.real-real*c2.imag)/d;    return c;}Complex Complex::operator-(){    Complex c;    c.imag=0-imag;    c.real=0-real;    return c;}//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;    c3=-c1;    cout<<"-c1="<<c3;    return 0;}

示例图片：

心得体会：上课时怎么都不明白为什么可以直接输出结果还有重载，现在明白了。实践

出的，高兴啊。。。

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