【转】【复】实现复数中的运算符重载

/* 
*Copyright (c) 2016,烟台大学计算机学院 
*All rights reserved. 
*文件名称：app.cpp 
*作    者：李磊涛 
*版 本 号：v1.0 
* 
*问题描述：项目-实现复数类中的运算符重载。 
*程序输出：两个数的算法公式及结果。 
*/  
#include <iostream>    
using namespace std;    
class Complex     
{    
public:    
    Complex(){real=0;imag=0;}    
    Complex(double r,double i){real=r; imag=i;}    
    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    
Complex Complex::operator+(const Complex &c2)   
{  
    Complex c;  
    c.real=real+c2.real;  
    c.imag=imag+c2.imag;  
    return c;  
}  
Complex Complex::operator*(const Complex &c2)  
{  
      
    Complex c;  
    c.real=real*c2.real-imag*c2.imag;    
    c.imag=imag*c2.real+real*c2.imag;  
    return c;  
  
}    
Complex Complex::operator/(const Complex &c2)  
{  
      
    Complex c;  
    c.real=(real*c2.real+imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);    
    c.imag=(imag*c2.real-real*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);    
    return c;  
  
}   
Complex Complex::operator-(const Complex &c2)  
{  
      
    Complex c;  
    c.real=real-c2.real;  
    c.imag=imag-c2.imag;  
    return c;  
  
}   
void Complex::display()  
{  
    cout<<"("<<real<<","<<imag<<"i)"<<endl;   
}  
//下面定义用于测试的main()函数    
int main()    
{    
    Complex c1(3,4),c2(5,-10),c3;    
    cout<<"c1=";    
    c1.display();    
    cout<<"c2=";    
    c2.display();    
    c3=c1+c2;    
    cout<<"c1+c2=";    
    c3.display();    
    c3=c1-c2;    
    cout<<"c1-c2=";    
    c3.display();    
    c3=c1*c2;    
    cout<<"c1*c2=";    
    c3.display();    
    c3=c1/c2;    
    cout<<"c1/c2=";    
    c3.display();    
    return 0;    
}