C++重载输入流

#include <bits/stdc++.h>

using namespace std;

struct Point {

    int x, y;

    Point(int xx, int yy):x(xx), y(yy) {}

    Point():x(0), y(0) {}

    friend ostream& operator << (ostream &os, const Point & p) {

        os << "[" << p.x << " " << p.y << "]";

    }

    friend istream& operator >> (istream &is,Point &p) {

        is >> p.x >> p.y;

    }

} a;

int main()

{

    cin >> a;

    cout << a << endl;

    return 0;

}