C/code/坐标点Point的运算符重载.cpp

#include <iostream>
using namespace std;

class Point {
private:
	int _x, _y;
	
public:
	Point(int x, int y) : _x(x), _y(y) {}
	
	//前置
	Point& operator++() {
		++_x;
		++_y;
		return *this;
	}
	
	//后置
	Point operator++(int) {
		Point temp = *this;
		_x++;
		_y++;
		return temp;
	}
	
	Point& operator--() {
		--_x;
		--_y;
		return *this;
	}
	
	Point operator--(int) {
		Point temp = *this;
		_x--;
		_y--;
		return temp;
	}
	
	friend ostream& operator<<(ostream& os, const Point& p) {
        os << "(" << p._x << ", " << p._y << ")";
        return os;
    }
	
	friend istream& operator>>(istream& is, Point& p) {
		is >>p._x >> p._y;
		return is;	
	}
};

int main() {
	Point p(1,2);
	cin >> p;
	
	cout << p << endl;
	
	Point p1 = p++;
	cout << p1 << endl;
	
	Point p2 = ++p;
	cout << p2 << endl;
	
	Point p3 = p--;
	cout << p3 << endl;
	
	Point p4 = --p;
	cout << p4 << endl; 
	
	return 0;
}