#include<iostream>
using namespace std;

void switch_pointer(int* p1, int* p2)
{
  int ** app;
  app = & p1;
  p1 = p2;
  p2 = *app;

}
/*
void switch_pointer(int*& p1, int*& p2)
{
  int * app;
  app = p1;
  p1 = p2;
  p2 = app;

}
*/
void main(){
  int a1=1;
  int a2=2;
  int * p1= &a1;
  int * p2= &a2;
  cout << "Beginnig, pointer one:" << *p1 << endl;  
  cout << "Beginnig, pointer two:" << *p2 << endl;  
  switch_pointer(p1,p2); 
  cout << "End, pointer one:" << *p1 << endl;  
  cout << "End, pointer two:" << *p2 << endl;  
}