016 惊呆！Point竟然能这样输入输出

流插入运算符和流提取运算符的重载的简单例子。

分析：

1. cin >> p   //需重载">>"

2. cout << p << endl;  //需重载"<<"

以下是完整代码：

#include <iostream>
using namespace std;
class Point {
private:
    int x;
    int y;
public:
    Point() { };
// 在此处补充你的代码
    friend istream & operator>>(istream & is, Point & p){
        is >> p.x >>p.y;
        return is;
    }
    friend ostream & operator<<(ostream & os, const Point & p ){
        os << p.x << "," << p.y;
        return os;
    }
};
int main()
{
    Point p;
    while(cin >> p) {  //需重载">>"
        cout << p << endl;  //需重载"<<"
    }
    return 0;
}