4-3-2

#include <iostream>
using namespace  std;
class Point
{
public:
    Point(int xx=0,int yy=0)
    {
        x=xx;
        y=yy;
        cout<<"Constructor is called"<<endl;
    }
    Point(Point &p);
    int getX()
    {
        return x;
    }
    int getY()
    {
        return y;
    }
private://number(编号)、sex(性别)、birthday(出生日期)、id（身份证号）
    int x,y;
};
Point::Point(Point &p)
{
    x=p.x;
    y=p.y;
    cout<<"Calling the copy constructor"<<endl;
}

void f(Point p)
{
    cout<<p.getX()<<endl;
}

Point g()
{
    Point a(1,2);
    return a;
}
int main()
{
  cout<<"Point a(1,2);"<<endl;
  Point a(1,2);
  cout<<"Point b(a);"<<endl;
  Point b(a);
  cout<<"Point c=a;"<<endl;
  Point c=a;
  cout<<"f(a);"<<endl;
  f(a);
  cout<<"c=g();"<<endl;
  c=g();
  return 0;
}