9-1

/*
* 作    者： 霍雨佳
* 完成日期：2014 年4月15日
* 版 本 号：v1.0
* 问题描述：实现复数类中的运算符重载。
* 样例输入：
* 样例输出：
* 问题分析：（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。
*/
#include <iostream>

using namespace std;

class Complex
{
public:
    Complex(){real=0;imag=0;}
    Complex(double r,double i){real=r; imag=i;}
    Complex operator+(Complex &c2);
    Complex operator-(Complex &c2);
    Complex operator*(Complex &c2);
    Complex operator/(Complex &c2);
    //一目运算符
    friend Complex operator-(Complex&);
    friend ostream&operator<<(ostream&,Complex&);
    friend istream&operator>>(istream&,Complex&);
private:
    double real;
    double imag;
};
//下面定义成员函数
Complex Complex::operator+(Complex &c2)
{
    return  Complex(c2.real+real,c2.imag+imag);
}
Complex Complex::operator-(Complex &c2)
{
    return  Complex(c2.real-real,c2.imag-imag);
}
Complex Complex::operator*(Complex &c2)
{
    return  Complex((c2.real*real-imag*c2.imag),(real*c2.imag+imag*c2.real));
}
Complex Complex::operator/(Complex &c2)
{
    Complex c;
    c.real=((c2.real*real+imag*c2.imag)/((c2.real*c2.real)+(c2.imag*c2.imag)));
    c.imag=((real*c2.imag-imag*c2.real)/((c2.real*c2.real)+(c2.imag*c2.imag)));
    return c;
}
Complex operator-(Complex &c)
{
    Complex c1;
    c1.imag=0-c.imag;
    c1.real=0-c.real;
    return c1;
}
 ostream&operator<<(ostream&output,Complex&c)
 {
     if(c.imag>0)
    {
    output<<"("<<c.real<<"+"<<c.imag<<"i)"<<endl;
    }
    else
    output<<"("<<c.real<<"-"<<-c.imag<<"i)"<<endl;
    return output;

 }
istream&operator>>(istream&input,Complex&c)
{
    cout<<"input real and imaginarry part of complex number:";
    input>>c.real>>c.imag;
    return input;
}
//下面定义用于测试的main()函数
int main()
{
    Complex c1,c2,c3;
    cin>>c1>>c2;
    cout<<"c1="<<c1<<endl;
    cout<<"c2="<<c2<<endl;
    c3=-c1;
    cout<<"-c1="<<c3<<endl;
    c3-c2;
    cout<<"-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;
    c3=c1/c2;
    cout<<"c1/c2="<<c3<<endl;
    return 0;
}

运行结果：

 

奋斗吧，少年！！！