第八周项目1-实现复数类中的运算符重载（3）-优快云博客

/* 
 * 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4月24日 
 * 版 本 号：v1.0 
 * 
 * 问题描述：定义一个定义完整的类（是可以当作独立的产品发布，成为众多项目中的“基础工程”）。这样的类在(2)的基础上，扩展+、-、*、/运算符的功能，使之能与double型数据进行运算。设Complex c; double d; c+d和d+c的结果为“将d视为实部为d的复数同c相加”，其他-、*、/运算符类似。
 * 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+(const Complex&c1,const Complex&c2);
    friend Complex operator-(const Complex&c1,const Complex&c2);
    friend Complex operator*(const Complex&c1,const Complex&c2);
    friend Complex operator/(const Complex&c1,const Complex&c2);
    friend Complex operator+(const Complex&c1,double b);
    friend Complex operator+(double b,const Complex&c1);
    friend Complex operator-(const Complex&c1,double b);
    friend Complex operator-(double b,const Complex&c1);
    friend Complex operator*(double b,const Complex&c1);
    friend Complex operator*(const Complex&c1,double b);
    friend Complex operator/(const Complex&c1,double b);
    friend Complex operator/(double b,const Complex&c1);
    void display();
private:
    double real;
    double imag;
};
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 Complex&c1,double b)
{
    Complex c;
    c.real=c1.real+b;
    c.imag=c1.imag;
    return c;
}
Complex operator+(double b,const Complex&c1)
{
    Complex c(b,0);//充分利用已定义好的代码，可以降低出错率，很聪明的选择
    return c+c1;
}
Complex operator-(const Complex&c1,double b)
{
    Complex c;
    c.real=c1.real-b;
    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-(double b,const Complex&c1)
{
    Complex c(b,0);
    return c-c1;
}
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 Complex&c1,double b)
{
    Complex c;
    c.real=c1.real*b;
    c.imag=c1.imag;
    return c;
}
Complex operator*(double b,const Complex&c1)
{
    Complex c(b,1);
    return c*c1;
}
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 Complex&c1,double b)
{
    Complex c;
    c.real=c1.real/b;
    c.imag=c1.imag;
    return c;
}
Complex operator/(double b,const Complex&c1)
{
    Complex c(b,0);
    return c/c1;
}
void Complex::display()
{
    cout<<"("<<real<<","<<imag<<"i"<<")"<<endl;
}
int main()
{
    double b;
    b=11;
    Complex c1(3,4),c3;
    cout<<"c1=";
    c1.display();
    cout<<"b="<<b<<endl;
    cout<<"c1+b=";
    c3=c1+b;
    c3.display();
    cout<<"b+c1=";
    c3=b+c1;
    c3.display();
    cout<<"c1-b=";
    c3=c1-b;
    c3.display();
    cout<<"b-c1=";
    c3=b-c1;
    c3.display();
    c3=c1*b;
    cout<<"c1*b=";
    c3.display();
    c3=b*c1;
    cout<<"b*c1=";
    c3.display();
    c3=c1/b;
    cout<<"c1/b=";
    c3.display();
    c3=b/c1;
    cout<<"b/c1=";
    c3.display();
    return 0;
}

运算结果：