第九周项目1-复数类中的运算符的重载（续）

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本文介绍了一个C++程序，该程序实现了复数类Complex的定义及其基本运算，包括加、减、乘、除，并重载了一目运算符-以及输入输出流操作符。通过这些操作符的重载，使得程序能够更自然地处理复数运算。

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/* 
 * Copyright (c) 2014, 烟台大学计算机学院 
 * All rights reserved. 
 * 文件名称：test.cpp 
 * 作    者：呼亚萍 
 * 完成日期：2015年5月11日 
 * 版 本 号：v1.0 
 * 
 * 问题描述：（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。
 * 程序输入：相应的程序
 * 程序输出：对应得结果
 */

#include<iostream>
using namespace std;
class Complex
{
public:
    Complex()
    {
        real=0;
        imag=0;
    }
    Complex(double r,double i)
    {
        real=r;
        imag=i;
    }
    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 operator-();
    friend istream& operator>>(istream&input,Complex&c);
    friend ostream& operator<<(ostream&output,Complex&c);
private:
    double real;
    double 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;

}
Complex Complex::operator-()
{
    Complex c;
    c.real=-1*real;
    c.imag=-1*imag;
    return c;

}

ostream& operator<<(ostream&output,Complex&c)
{
    output<<"("<<c.real;
    if(c.imag>0)
        output<<"+";
    output<<c.imag<<"i)"<<endl;
    return output;
}
istream& operator>>(istream&input,Complex&c)
{

    int a,b;
    char sign,i;
    do
    {
        cout<<"请按照a+bi或a-bi的形式输入"<<endl;
        input>>a>>sign>>b>>i;
    }
    while(!((sign=='+'||sign=='-')&&i=='i'));
    c.real=a;
    c.imag=(sign=='+')?b:-b;
    return input;
}
int main()
{
    Complex c1,c2,c3;
    cout<<"c1:";
    cin>>c1;
    cout<<"c2:";
    cin>>c2;
    c3=c1+c2;
    cout<<"c1+c2=";
    cout<<c3;
    c3=c1-c2;
    cout<<"c1-c2=";
    cout<<c3;
    c3=c1*c2;
    cout<<"c1*c2=";
    cout<<c3;
    c3=c1/c2;
    cout<<"c1/c2=";
    cout<<c3;
    c3=-c1;
    cout<<"-c1=";
    cout<<c3;
    return 0;
}

运算结果：