C++中运算符的重载

#include<iostream>

using namespace std;

class Complex

{

public:

Complex (double real = 0 , double image = 0 );

// ~Complex();

Complex (const Complex& d);

Complex& operator= (const Complex& d);

void Display();

public:

friend ostream& operator<<(complex& out,complex& cmp);

Complex& operator++();

Complex operator++(int);

// Complex& operator--();

// Complex operator--(int); //后置--

//

Complex operator+(const Complex& c);

// Complex operator-(const Complex& c);

//

Complex& operator-=(const Complex& c);

// Complex& operator+=(const Complex& c);

//

Complex operator*(const Complex& c);

// Complex operator/(const Complex& c);

private:

double _real;// 实部

double _image;// 虚部

};

void Complex:: Display()

{

cout<<_real<<" "<<_image<<endl;

}

//Complex:: ~Complex()//析构函数

//{

// cout<<"调用析构函数"<<endl;

//}

Complex:: Complex (const Complex& d)// 拷贝构造函数

{

_real = d._real;

_image = d._image;

}

Complex& Complex:: operator= (const Complex& d)//赋值运算符重载

_real = d._real;

_image = d._image;

return *this;

}

Complex& Complex:: operator++()//前置加加运算符重载

{

++this->_real;

++this->_image;

return *this;

}

Complex Complex:: operator++(int)//后置加加运算符重载

{

Complex tmp;

tmp.-real = this->_real++;

tmp._image = this->_image++;

return tmp;

}

Complex Complex:: operator+(const Complex& c)//加号运算符重载

{

Complex tmp;

tmp._real = this->_real + c._real;

tmp._image = this->_image + c._image;

return tmp;

}

Complex& Complex::  operator-=(const Complex& c)//减等运算符重载

{

this->_real = this->_real - c._real;

this->_image = this->_image - c._image;

return *this;

}

Complex  Complex:: operator*(const Complex& c)//乘运算符重载

{

Complex tmp;

tmp._real = this->_real * c._real - this->_image * c._image;

tmp._image = this->_real * c._image + this->_real * c._real ;

return tmp;

}

Complex:: Complex(double real,double image)//带缺省值的构造函数

{

_real = real;

_image = image;

}

ostream& operator<<(complex& out,complex& cmp)

{

out<<cmp._real;

if(cmp._image>0)

out<<"+";

if(cmp._image != 0)

out<<cmp._image<<"i\n";

return out;

}

int main()

{

Complex c1(2,2);

Complex c2(4,4);

Complex c3(0,0);

c3 = c1 * c2;

c3.Display();

return 0;

}