C ++ objects and classes function is passed a reference to a class object

 1 #include <iostream>
 2 #include<string>
 3 using namespace std;
 4 
 5 class Point {
 6 public:
 7     Point(int a, int b) :x(a), y(b) {};
 8     //Point(Point& p) :x(p.x), y(p.y) {};
 9     int getX() { return x; }
10     int getY() { return y; }
11     void print() {
12         cout << "x: "X << << endl << " Y: " << Y << endl;
 13 is      }
 14  Private :
 15      int X, Y;
 16  };
 . 17  
18 is Point re_Ponit ( int A, int B) { 
 . 19      Point RES (A , B); // create a local variable 
20 is      return RES;   // pass the object entity 
21 is  }
 22 is  
23 is Point & re_PonitReference1 ( int a, int B) {
 24      Point RES (a, B); // create a local variable 
25     return RES;   // pass object references (similar pointer) 
26 is  }
 27  
28 Point & re_PonitReference2 ( int A, int B) {
 29      Point * RES = new new Point (A, B); // dynamic memory allocation 
30      return * RES;   / / transfer object reference 
31 is  }
 32  
33 is  
34 is  int main ()
 35  {
 36      Point re_Ponit A1 = ( . 1 , 2 ); // copy constructor 
37 [      Point & re_PonitReference1 A2 = ( 2 , . 3); // Assignment by reference (this function is passed a reference to a local variable) 
38 is      Point & re_PonitReference2 A3 = ( 2 , . 3 ); // reference assignment (the transfer function is a reference to a heap memory variable) 
39      a1.print (); // 1,2 
40      a2.print (); // random value 
41 is      a3.print (); // 2,3 
42 is }