第九周 项目一：复数类中的运算符重载（续）

问题及代码：

/*
* Copyright (c) 2015,烟台大学计算机学院
* All rights reserved.
* 文件名称：test.cpp
* 作者：李楠
* 完成日期：2015年4月29日
* 版本号：v1.0
*
* 问题描述：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。
* 输入描述：略
* 程序输出：略
*/
#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+(const Complex &c1,const Complex &c2);
    friend Complex operator+(const double d,const Complex &c2);
    friend Complex operator+(const Complex &c1,const double d);
    friend Complex operator-(const Complex &c1,const Complex &c2);
    friend Complex operator-(const double d,const Complex &c2);
    friend Complex operator-(const Complex &c1,const double d);
    friend Complex operator*(const Complex &c1,const Complex &c2);
    friend Complex operator*(const double d,const Complex &c2);
    friend Complex operator*(const Complex &c1,const double d);
    friend Complex operator/(const Complex &c1,const Complex &c2);
    friend Complex operator/(const double d,const Complex &c2);
    friend Complex operator/(const Complex &c1,const double d);
    friend ostream&operator<<(ostream&,Complex&);
    friend istream&operator>>(istream&,Complex&);
    Complex operator-();
private:
    double real;
    double imag;
};
//下面定义成员函数
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)
{
     input>>c.real>>c.imag;
     return input;
}
Complex Complex::operator-()
{
    Complex c;
    c.real=-real;
    c.imag=-imag;
    return c;
}
Complex operator+(const Complex &c1,const Complex &c2)
{
    Complex c;
    c.real=c1.real+c2.real;
    c.imag=c1.imag+c2.imag;
    return c;
}
Complex operator+(const double d,const Complex &c2)
{
    Complex c;
    c.real=d+c2.real;
    c.imag=c2.imag;
    return c;
}
Complex operator+(const Complex &c1,const double d)
{
    Complex c;
    c.real=d+c1.real;
    c.imag=c1.imag;
    return c;
}
Complex operator-(const Complex &c1,const Complex &c2)
{
    Complex c;
    c.real=c1.real-c2.real;
    c.imag=c1.imag-c2.imag;
    return c;
}
Complex operator-(const double d,const Complex &c2)
{
    Complex c;
    c.real=d-c2.real;
    c.imag=-c2.imag;
    return c;
}
Complex operator-(const Complex &c1,const double d)
{
    Complex c;
    c.real=c1.real-d;
    c.imag=c1.imag;
    return c;
}
Complex operator*(const Complex &c1,const 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*(const double d,const Complex &c2)
{
    Complex c;
    c.real=d*c2.real;
    c.imag=d*c2.imag;
    return c;
}
Complex operator*(const Complex &c1,const double d)
{
    Complex c;
    c.real=d*c1.real;
    c.imag=d*c1.imag;
    return c;
}
Complex operator/(const Complex &c1,const 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 operator/(const double d,const Complex &c2)
{
    Complex c;
    c.real=(d*c2.real)/(c2.real*c2.real+c2.imag*c2.imag);
    c.imag=(-d*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);
    return c;
}
Complex operator/(const Complex &c1,const double d)
{
    Complex c;
    c.real=(c1.real*d)/(d*d);
    c.imag=(c1.imag*d)/(d*d);
    return c;
}
//下面定义用于测试的main()函数
int main()
{
    Complex c1(3,4),c2(5,-10),c3,c4;
    cout<<"输入c4的实部和虚部：";
    cin>>c4;
    cout<<"c4="<<c4;
    cout<<"c1=";
    cout<<c1;
    cout<<"c2=";
    cout<<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+2;
    cout<<"c1+2=";
    cout<<c3;
    c3=3+c1;
    cout<<"3+c1=";
    cout<<c3;
    c3=c2-2;
    cout<<"c2-2=";
    cout<<c3;
    c3=1-c2;
    cout<<"1-c2=";
    cout<<c3;
    c3=c1*3;
    cout<<"c1*3=";
    cout<<c3;
    c3=5*c1;
    cout<<"5*c1=";
    cout<<c3;
    c3=c2/5;
    cout<<"c2/5=";
    cout<<c3;
    c3=6/c1;
    cout<<"6/c1=";
    cout<<c3;
    c3=-c1;
    cout<<"-c3="<<c3;
    return 0;
}

运行结果：

 

知识点总结：

只是在原来的基础上加了一个取反，注意实部和虚部都要取反；

在写重载流输入运算符和流提取运算符的时候要注意写成友元函数！！！还要注意形式

学习心得：

真是好方便~直接cin cout就行了。