第十周上机项目1复数类中的运算符重载

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/* *Copyright (c) 2015, 烟台大学计算机学院 *All rights reserved. *文件名称：text.cpp *作者：陈栋梁 *完成日期：2015年 5月 13日 *版本号：v1.0 * */#include <iostream>using namespace std;class Complex{public:    Complex()    {        real=0;        imag=0;    }    Complex(double r,double i)    {        real=r;        imag=i;    }    Complex operator-();    friend ostream& operator << (ostream& output, const Complex& c);    friend istream& operator >> (istream& input, Complex& c);    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);private:    double real;    double imag;};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 complex number(a+bi或a-bi):";        input>>a>>sign>>b>>i;    }    while(!((sign=='+'||sign=='-')&&i=='i'));    c.real=a;    c.imag=(sign=='+')?b:-b;    return input;}Complex Complex::operator-(){    return Complex(-real,-imag);}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.real*c2.imag;    return c;}Complex operator/(Complex &c1, Complex &c2){    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;}int main(){    Complex c1,c2,c3;    cout<<"c1: "<<endl;;    cin>>c1;    cout<<"c2: "<<endl;    cin>>c2;    cout<<"c1="<<c1<<endl;    cout<<"c2="<<c2<<endl;    c3=c1+c2;    cout<<"c1+c2="<<c3<<endl;    c3=c1-c2;    cout<<"c1-c2="<<c3<<endl;    c3=c1*c2;    cout<<"c1*c2="<<c3<<endl;    c3=c1/c2;    cout<<"c1/c2="<<c3<<endl;    return 0;}
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