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Program 2

// Compilable parts of previous program.

#include <iostream>
#include <string>
#include "point.h"

int main(){
  Point p(1,2);             // p is a Point. It can be moved (by mutation).
  p.move(0,1);

  const Point q(3,4);       // q is a constant point.

  const Point *r = &p;      // r is pointer to a constant point

  Point const *rr = &p;     // rr is pointer to a constant point - fully equivalent to definition or r above.

  Point *const s = &p;      // s is a constant pointer to 'the point p'. *const is a 'declarator operator'.
  s->move(1,2);             // OK.

  Point const* w = &p;      // w is a pointer to a constant point.  const* is NOT a 'declarator operator'.
                            // Point const ...  and  const Point means the same.

  const Point *const t= &p; // t is a constant pointer to a constant point.

  Point const *const v= &p; // Same as definition of t (Point and const has just been reversed). 
}