016：惊呆！Point竟然能这样输入输出

#include <iostream> 
using namespace std;
class Point { 
    private: 
        int x; 
        int y; 
    public: 
        Point() { };
friend istream& operator>>(istream& is,Point& p){
10             is >> p.x >> p.y;
11             return is;
12         }
13         friend ostream& operator<<(ostream& os,Point& p){
14             os << p.x << "," << p.y;
15             return os;
16         }
}; 
int main() 
{ 
     Point p;
     while(cin >> p) {
         cout << p << endl;
     }
    return 0;
}