第九周（运算符重载复数类）

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/*
*copyright(c) 2015,烟台大学计算机学院
*All rights reserved。
*文件名称：第九周（运算符重载）

*作者：王忠
*完成日期：2015.5.13

*版本号：v1.0
*
*问题描述：定义Complex类中的<<和>>运算符的重载，实现输入和输出，

*输入描述：

*程序输出：

#include <iostream>using namespace std;class Complex{public:    Complex(){real=0;imag=0;}    Complex(double r,double i){real=r; imag=i;}    Complex operator+(const Complex &c2);    Complex operator-(const Complex &c2);    Complex operator*(const Complex &c2);    Complex operator/(const Complex &c2);    friend Complex operator-(Complex &c2);    void display();    friend ostream& operator <<(ostream& output,const Complex& c);    friend istream& operator >>(istream& input,Complex& c);private:    double real;    double imag;};//下面定义成员函数    Complex Complex::operator+(const Complex &c2)    {        Complex c;        c.real=real+c2.real;        c.imag=imag+c2.imag;        return c;    }    Complex Complex::operator-(const Complex &c2)    {        Complex c;        c.real=real-c2.real;        c.imag=imag-c2.imag;        return c;    }    Complex Complex::operator*(const Complex &c2)    {        Complex c;        c.real=real*c2.real-imag*c2.imag;        c.imag=imag*c2.real+real*c2.imag;        return c;    }    Complex Complex::operator/(const Complex &c2)    {        Complex c;        c.real=(real*c2.real+imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);        c.imag=(imag*c2.real-real*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);        return c;    }void Complex::display(){    cout<<real;    if(imag>0)        cout<<'+'<<imag<<'i'<<endl;    else        cout<<imag<<'i'<<endl;}Complex operator-(Complex &c2){    Complex c;    return (c-c2);}ostream& operator <<(ostream& output,const Complex& c){    output<<'('<<c.real;    if(c.imag>=0)        output<<'+';    output<<c.imag<<"i)";    return output;}istream& operator >>(istream& input,Complex& c){    int a,b;    char sign,i;    do    {        cout<<"input (a+bi or a-bi)\n";        input>>a>>sign>>b>>i;    }while(!(sign=='+'||sign=='-')&&i=='i');    c.real=a;    c.imag=(sign=='+')?b:-b;    return input;}//下面定义用于测试的main()函数int main(){    Complex c1,c2,c3;    cout<<"c1: "<<endl;;    cin>>c1;    cout<<"c2: "<<endl;    cin>>c2;    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();    c3=-c3;    c3.display();    return 0;}

又成功一个，耶

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