实验2

#include <iostream>
using std::cout;
using std::endl;

class Point {
public:
    Point(int x0 = 0, int y0 = 0);
    Point(const Point&p );
    ~Point() = default;
    
    int get_x() const { return x; } 
    int get_y() const { return y; } 
    void show() const;
    
private:
    int x, y;
};

Point::Point(int x0, int y0): x{x0}, y{y0} {
    cout << "constructor called." << endl;
}

Point::Point(const Point& p): x{p.x}, y{p.y} {
    cout << "copy constructor called." << endl;
}

void Point::show() const {
    cout << "(" << x << ", "
    << y << ")" << endl;
}

int main() {
    Point p1(5, 6); 
    p1.show();
    Point p2 = p1;
    p2.show();
    
    Point p3(p2);
    p3.show();
    cout << p3.get_x() << endl;
}