第九周项目一-复数类的中的运算符重载（续）

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在复数类中的运算符重载基础上
（1）再定义一目运算符 -，-c相当于0-c。

（2）定义Complex类中的<<和>>运算符的重载，实现输入和输出，改造原程序中对运算结果显示方式，使程序读起来更自然

/** Copyright (c) 2015,烟台大学计算机学院* All right reserved.* 作者：赵嵩* 文件：Demo.cpp* 完成时间：2015年05月16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;    }    friend ostream& operator << (ostream& output, const Complex& c);    friend istream& operator >> (istream& input, Complex& c);    Complex operator-();    Complex operator+(const Complex &c2);    Complex operator-(const Complex &c2);    Complex operator*(const Complex &c2);    Complex operator/(const Complex &c2);    void display();private:    double real;    double imag;};//下面定义成员函数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(-*this);}Complex Complex::operator+(const Complex &c2){    Complex a;    a.real=real+c2.real;    a.imag=imag+c2.imag;    return a;}Complex Complex::operator-(const Complex &c2){    Complex a;    a.real=real-c2.real;    a.imag=imag-c2.imag;    return a;}Complex Complex::operator*(const Complex &c2){    Complex a;    a.real=real*c2.real;    a.imag=imag*c2.imag;    return a;}Complex Complex::operator/(const Complex &c2){    Complex a;    a.real=real/c2.real;    a.imag=imag/c2.imag;    return a;}void Complex::display(){    cout<<"("<<real<<","<<imag<<"i)"<<endl;}//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<<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;}

运行结果：

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