帮帮忙，重载运算符相关的

#include<iostream>
using namespace std;

class Point
{
    public:
        Point() : x(0), y(0)
        {
            cout << "Initialize!" << endl;
        }
        Point(int a, int b) : x(a), y(b)
        {
            cout << "Initialize!" << endl;
        }
        friend ostream &operator << (ostream& output, Point& point);
        friend istream &operator > (istream& input, Point &point);
        ~Point()
        {
            cout << "Set free!" << endl;
        }
    private:
        int x, y;
};

ostream &operator << (ostream& output, Point& point)
{
    output << "(" << point.x << "," << point.y << ")" << endl;
    return output;
}
istream &operator>> (istream& input, Point &point)
{
    input >> point.x;
    input >> point.y;
    return input;
}


int main()
{
    Point A(3, 5), B;
    cin >> B;
    cout << A << endl << B << endl;

    return 0;
}