C++ 声明并实现一个复数类

<pre name="code" class="cpp">/******************************************************************************************
complex.hpp:
Copyright (c) Bit Software, Inc.(2013), All rights reserved.

Purpose:
声明并实现一个复数类

难度：**

Author:
xxx

Created Time:
2015-4-26
******************************************************************************************/

#ifndef COMPLEX_HPP_INCLUDED
#define COMPLEX_HPP_INCLUDED
#include <iostream>
using namespace std;
class complex
{
public:
// 带缺省值的构造函数
complex (double real = 0, double image = 0)
:_real(real)
,_image(image)
{
cout<<"complex (double real = 0, double image = 0)"<<endl;
}

// 析构函数
~complex()
{
cout<<"~complex()"<<endl;
}

// 拷贝构造函数
complex (const complex& d)
:_image(d._image)
,_real(d._real)
{
cout<<"complex (const complex& d)"<<endl;
}

// 赋值运算符重载
// 思考为什么operator=赋值函数需要一个date&的返回值？？
complex& operator= (const complex& d)
{
cout<<"operator= (const complex& d)"<<endl;

if (this != &d)
{
this->_real = d._real;
this->_image = d._image;
}
return *this;
}

// 取地址运算符重载
complex* operator& ()
{
cout<<"operator&()"<<endl;
return this;
}

// const修饰的取地址运算符重载
const complex* operator& () const
{
cout<<"operator&() const"<<endl;
return this;
}

void display()
{
cout<<"real:"<<_real<<"--image:"<<_image<<endl<<endl;
}
complex operator+(const complex& c)
{
cout<<"operator+(const complex& c)"<<endl;
return complex(_real+c._real,_image+c._image);
}

complex operator-(const complex& c)
{
cout<<"operator-(const complex& c)"<<endl;
return complex(_real-c._real,_image-c._image);
}
complex operator*(const complex& c)
{
cout<<"operator*(const complex& c)"<<endl;
return complex(_real*c._real-_image*c._image,c._image*_real+_image*c._real);
}
complex operator/(const complex& c)
{
cout<<"operator/(const complex& c)"<<endl;
return complex<span style="font-family: Arial, Helvetica, sans-serif;">((_real/c._real+_image*c._image)/(c,_real*c._real+c._image*c._image),(_image*c._real-_real*c._image)/(c,_real*c._real+c._image*c._image))</span><span style="font-family: Arial, Helvetica, sans-serif;">; </span>
}

private:
double _real;
double _image;
};

#endif // COMPLEX_HPP_INCLUDED

#include "complex.hpp"
int main()
{
//test_complex1();
cout << "**********************" << endl;
complex a(1.1,2.2);
complex b(3.3,4.4);
complex c;
c = a + b;
c.display();

c = a - b;
c.display();

c = a * b;
c.display();

c = a / b;
c.display();

return 0;
}