运算符重载之加号运算符重载

#include<iostream>
using namespace std;
class pig{
public:
	int kilogram;   //重量
	int price;     //价钱
	//成员函数重载+号运算符
	//pig operator+(pig& p)
	//{
	//	pig temp;
	//	temp.kilogram = this->kilogram + p.kilogram;
	//	temp.price = this->price + p.price;
	//	return temp; //不加return，存放在栈区的数据会在调用完之后直接释放
	//}
};
//全局函数重载加号
pig operator+(pig& p1,pig& p2)
{
	pig temp;
	temp.kilogram = p1.kilogram + p2.kilogram;
	temp.price =p1.price + p2.price;
	return temp; //不加return，存放在栈区的数据会在调用完之后直接释放
}
//函数重载
pig operator+(pig& p, int n)
{
	pig temp;
	temp.kilogram = p.kilogram + n;
	temp.price = p.price + n;
	return temp;//不加return，存放在栈区的数据会在调用完之后直接释放
}
void test01()
{
	pig p1, p2;
	p1.kilogram = 300;
	p1.price = 1000;
	p2.kilogram = 250;
	p2.price = 800;
	pig p3;
	p3 = p2 + p1;
	cout << "p3猪的重量" << p3.kilogram << "  " << "p3猪的价钱" << p3.price << endl;
	//运算符重载，也可以发生函数重载
	p3 = p2 + 100; //perosn +int
	cout << "p3猪的重量" << p3.kilogram << "  " << "p3猪的价钱" << p3.price << endl;
}
int main()
{
	test01();
	system("pause");
	return 0;
}