C++运算符重载

#include <iostream>
using namespace std;

class Base
{
public:
	Base()
	{
		x=y=0;
		cout<<"Base()"<<this<<endl;
	}
	Base(int x, int y)
	{
		this->x = x;
		this->y = y;
		cout<<"Base(int x, int y)"<<this<<endl;
	}
	Base(const Base&b)
	{
		this->x = b.x;
		this->y = b.y;
		cout<<"Base(Base&b)"<<this<<endl;
	}
	~Base()
	{
		cout<<"~Base"<<this<<endl;
	}
	Base operator+(const Base& b)const
	{
		Base bRet;
		bRet.x = x + b.x;
		bRet.y = y + b.y;
		cout<<"Base operator+"<<endl;
		return bRet;
	}
	Base operator-(const Base&b)const
	{
		Base bRet;
		bRet.x = this->x - b.x;
		bRet.y = this->y - b.y;
		cout<<"Base operator-"<<endl;
		return bRet;
	}
	Base operator*(const Base&b)const
	{
		Base bRet;
		bRet.x = this->x*b.x;
		bRet.y = this->y*b.y;
		cout<<"Base operator*"<<endl;
		return bRet;
	}
	Base operator/(const Base&b)const
	{
		Base bRet;
		bRet.x = this->x/b.x;
		bRet.y = this->y/b.y;
		cout<<"Base operator/"<<endl;
		return bRet;
	}
	Base operator!()
	{
		Base bRet;
		bRet.x = !x;
		bRet.y = !y;
		cout<<"Base operator!"<<endl;
		return bRet;
	}
	Base& operator=(const Base&b)
	{
		this->x = b.x;
		this->y = b.y;
		cout<<"Base operator="<<endl;
		return *this;
	}
	void display()
	{
		cout<<"x = "<<x<<", y = "<<y<<endl;
	}
private:
	int x;
	int y;
};

int main()
{
	Base b1(2, 3);
	Base b2(6, 9);
	Base b3 = b1 + b2;
	cout<<"&b1 = "<<&b1<<endl;
	cout<<"&b2 = "<<&b2<<endl;
	cout<<"&b3 = "<<&b3<<endl;

	b3.display();
	b3 = b2 - b1;
	b3.display();
	b3 = b1 * b2;
	b3.display();
	b3 = b2/b1;
	b3.display();
	b3 = !b1;
	b3.display();
	b1 = b2;
	b3.display();
	b1.display();

	return 0;
}