C++之“运算符重载”

C++可以重载的运算符有：

1.前置++和后置++

2.前置--与后置--

3.+，-，*，/，%运算符

4.>,<,<=,>=,==,!=运算符

5.<<,>>（流提取与流插入）运算符

（特别注意：要对类的对象使用运算符，不能重载的运算符：=，& ，逗号运算符）

#include<iostream>using namespace std;class Operate{		friend ostream&  operator<<(ostream &out, const Operate oper1);//<<运算符	friend istream&  operator>>(istream &input, const Operate &oper2);	//>>运算符public:		Operate(int=1 ,int=1);//构造函数	Operate & operator-();//负号运算符	Operate & operator++();//前面++	Operate operator++(int);	//后置++									Operate  operator+(const Operate & oper);//+号运算符	Operate operator-(const Operate &oper);//相减运算法	Operate operator*(const Operate &oper);//相乘运算法	Operate operator/(const Operate &oper);//相除运算法	Operate operator%(const Operate &oper);//相除运算法	bool operator>(const Operate & oper);//>运算符	bool operator<(const Operate & oper);//<运算符	bool operator>=(const Operate & oper);//>=运算符	bool operator<=(const Operate & oper);//<=运算符	bool operator==(const Operate & oper);//==运算符	bool operator!=(const Operate & oper);//!=运算符	int  getX();//获取X	int  getY();//获取YPRivate:	int m_iX;	int m_iY;};Operate::Operate(int x, int y){	m_iX = x;	m_iY = y;}//负号运算符Operate& Operate::operator-(){	m_iX = -m_iX;	m_iY = -m_iY;	return *this;}//前面++Operate& Operate::operator++(){	m_iX++;	m_iY++;	return *this;}//后置++Operate Operate::operator++(int){	Operate old(*this);	m_iX++;	m_iY++;	return old;}//+号运算符Operate Operate::operator+(const Operate &oper){	Operate temp;	temp.m_iX = this->m_iX + oper.m_iX;	temp.m_iY = this->m_iY + oper.m_iY;	return temp;}//减运算符Operate Operate::operator-(const Operate &oper){	Operate temp;	temp.m_iX = this->m_iX - oper.m_iX;	temp.m_iY = this->m_iY - oper.m_iY;	return temp;}//乘法运算符Operate Operate::operator*(const Operate &oper){	Operate temp;	temp.m_iX = this->m_iX *oper.m_iX;	temp.m_iY = this->m_iY * oper.m_iY;	return temp;}//除运算符Operate Operate::operator/(const Operate &oper){	Operate temp;	temp.m_iX = this->m_iX / oper.m_iX;	temp.m_iY = this->m_iY / oper.m_iY;	return temp;}//取模运算符Operate Operate:: operator%(const Operate &oper){	Operate temp;	temp.m_iX = this->m_iX %oper.m_iX;	temp.m_iY = this->m_iY % oper.m_iY;	return temp;}//>运算符bool Operate:: operator>(const Operate & oper){	if (this->m_iX > oper.m_iX&&this->m_iY > oper.m_iY)		return true;	else		return false;}//<运算符bool Operate:: operator<(const Operate & oper){	if (this->m_iX <oper.m_iX&&this->m_iY <oper.m_iY)		return true;	else		return false;}//<=运算符bool Operate:: operator<=(const Operate & oper){	if (this->m_iX <=oper.m_iX&&this->m_iY <=oper.m_iY)		return true;	else		return false;}//>=运算符bool Operate:: operator>=(const Operate & oper){	if (this->m_iX >=oper.m_iX&&this->m_iY >=oper.m_iY)		return true;	else		return false;}//==运算符bool Operate:: operator==(const Operate & oper){	if (this->m_iX ==oper.m_iX&&this->m_iY ==oper.m_iY)		return true;	else		return false;}//!=运算符bool Operate:: operator!=(const Operate & oper){	if (this->m_iX !=oper.m_iX&&this->m_iY !=oper.m_iY)		return true;	else		return false;}//<<运算符的友元函数ostream & operator<<(ostream &out, const Operate oper1){	out << oper1.m_iX << "," << oper1.m_iY << endl;	return out;}//>>运算符的友元函数istream &  operator>>(istream &input,  const Operate  &oper2){	input >> oper2.m_iX;	input>> oper2.m_iY;	return input;}int  Operate::getX(){	return m_iX;}int Operate::getY(){	return m_iY;}int main(){//main函数测试 }学会巧妙的使用运算符，在写很多程序中尤为重要。
运算符重载有助于C++的可扩展性，它是C++最吸引人的特征之一。当运算符重载比完成相同工作的函数调用程序更清晰的时候，请选择运算符重载！