15第八周项目一——实现复数类中的运算符重载（友元函数）

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/*
* Copyright (c) 2014, 烟台大学计算机学院
* All rights reserved.
* 文件名称：test.cpp
* 作者：李晓凯
* 完成日期：2015年 4 月 26 日
* 版本号：v1.0
*
* 问题描述：用类的友元函数，定义复数类重载运算符+、-、*、/，使之用于复数的加减乘除

* 输入描述：
* 程序输出：运算结果

#include <iostream>using namespace std;class 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);    friend Complex operator/(Complex &c1,Complex &c2);    void display();private:    double real;    double imag;};//下面定义成员函数Complex operator+(Complex &c1,Complex &c2){    Complex c;    c.real=c1.real+c2.real;    c.imag=c1.imag+c2.imag;    return c;}Complex operator-(Complex &c1,Complex &c2){    Complex c;    c.real=c1.real-c2.real;    c.imag=c1.imag-c2.imag;    return c;}Complex operator*(Complex &c1,Complex &c2){    Complex c;    c.real=c1.real*c2.real-c1.imag*c2.imag;    c.imag=c1.imag*c2.real+c1.imag*c2.imag;    return c;}Complex operator/(Complex &c1,Complex &c2){    Complex c;    double d;    d=c2.real*c2.real+c2.imag*c2.imag;    c.real=(c1.real*c2.real+c1.imag*c2.imag)/d;    c.imag=(c1.imag*c2.real-c1.real*c2.imag)/d;    return c;}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();    cout<<endl;    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;}

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