/* C++ Programming, Example answer, Exercise 1, Sheet 7  */

/* Author: Rob Miller and William Knottenbelt
   Program last changed: 30th September 2001    */

/* This program illustrates the use of the operators "*",
   "&", "new" and "delete". */ 

#include <iostream>
using namespace std;

typedef int *IntPtrType; 

int main()
{
	IntPtrType ptr_a, ptr_b, *ptr_c;
	
	ptr_a = new int;
	*ptr_a = 3;
	ptr_b = ptr_a;
	cout << *ptr_a << " " << *ptr_b << "\n";
	
	ptr_b = new int;
	*ptr_b = 9;
	cout << *ptr_a << " " << *ptr_b << "\n";
	
	*ptr_b = *ptr_a;
	cout << *ptr_a << " " << *ptr_b << "\n";
	
	delete ptr_a;
	ptr_a = ptr_b;
	cout << *ptr_a << " " << *&*&*&*&*ptr_b << "\n";
	
	ptr_c = &ptr_a;
	cout << *ptr_c << " " << **ptr_c << "\n";
	
	delete ptr_a;
	ptr_a = NULL;

	return 0;
}

/* THE OUTPUT OF THIS PROGRAM IS:

3 3
3 9
3 3
3 3
aa2644 3

'ptr_c' is a 'pointer-to-a-pointer'.

('aa2644' is the address of 'ptr_a' 
and may vary from rurn to run and 
machine to machine) 

*/