/* Double pointer program */

#include<stdio.h>
#include <stdlib.h>
#include <iostream>

using namespace std ;

int main(int argc , char** args)
{
	int x1 = 100 ;
	int x2 = 200 ;
	int* ptr1 ;
	int** doublePtr ;


	ptr1 = &x1 ;
	doublePtr = &ptr1 ;

	cout << *ptr1 << endl ;
	//2 Levels of indirection
	cout << **doublePtr << endl ;
	*doublePtr = &x2 ;

	cout << **doublePtr << endl ;
	cout << *ptr1 << endl ;

	return(1) ;

}