第十二周项目一-实现复数类中的运算符重载（2）

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/* *Copyright(c)2016,烟台大学计算机与控制工程学院 *All rights reserved *文件名称：123.cpp *作    者：王蕊 *完成日期：2016年5月15日 *版 本 号：v1.0 * *问题描述：请用类的友元函数，而不是成员函数，再次完成上面提及的运算符的重载。*/#include <iostream>using namespace std;class Complex{public:    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);    Complex()    {        real=0.0;        imag=0.0;    }    Complex(double r,double i)    {        real=r;        imag=i;    }    void display();private:    double real;    double imag;};Complex operator+(Complex &c1, Complex &c2)  //复数相加{    Complex c;    c.real=c1.real+c2.real;    c.imag=c1.imag+c2.imag;    return c;}Complex operator-(Complex &c1, Complex &c2)  //复数相减{    Complex c;    c.real=c1.real-c2.real;    c.imag=c1.imag-c2.imag;    return c;}Complex operator*(Complex &c1, Complex &c2)  //复数相乘：(a+bi)(c+di)=(ac－bd)+(bc+ad)i.{    Complex c;    c.real=c1.real*c2.real-c1.imag*c2.imag;    c.imag=c1.imag*c2.real+c1.real*c2.imag;    return c;}Complex operator/(Complex &c1, Complex &c2)  //复数相除：(a+bi)/(c+di)=(ac+bd)/(c^2+d^2) +(bc-ad)/(c^2+d^2)i。{    Complex c;    c.real=(c1.real*c2.real+c1.imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);    c.imag=(c1.imag*c2.real-c1.real*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);    return c;}void Complex::display(){    cout<<"("<<real<<","<<imag<<"i)"<<endl;}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;}
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