使用C++语言特性中支持面向对象的语法，实现一个Point类来描述点的基础属性和操作。

 1 #include<iostream>
 2 using namespace std;
 3 class Point{
 4     public:
 5         Point(int x0=1,int y0=2);
 6         Point (const Point &p);
 7         ~Point()=default;
 8         int get_x()const{return x;}
 9         int get_y()const{return y;}
10         void show()const;
11     private:
12         int x,y;
13 };
14 Point::Point(int x0,int y0):x{x0},y{y0}{
15     cout<<"constrctor called"<<endl;
16 }
17 Point::Point(const Point &p):x{p.x},y{p.y}{
18     cout<<"copy constrctor called"<<endl;
19 }
20 void Point::show()const{
21     cout<<"("<<x<<","<<y<<")"<<endl;
22 }
23 int main(){
24     Point p1;
25     p1.show();
26     Point p2(4,5);
27     p2.show();
28     Point p3=p2;
29     p3.show();
30     Point p4{p3};
31     p4.show();
32     cout<<p4.get_x()<<endl;
33 }