// ptr8.cpp 		By: Aiman Hanna -  ©1993-2006 Aiman Hanna

// This program illustrates how pointers can be passed as parameters to functions. How
// this can be related to passing parameters by reference?
// 
// Key points: 	1) Passing pointers as function parameters. 

#include <iostream.h>

void Twice(int *ptr, int ind1 , int ind2)
{
	*(ptr + ind1) *= 2;			// Same as a[ind1] if a is an array and ptr = a
	*(ptr + ind2) *= 2;			

}



int main()
{
 int a[3], *p = new int;

 a[0] = 4; a[1] = 5; a[2] = 7; 

 p = a; 

 cout << " This is the array before applying \"Twice\".... \n";
 for ( int i = 0 ; i < 3 ; i++ )
	 cout << a[i] <<"\n";

 Twice(p , 0 , 2);
 
 cout << "\n This is the array after applying \"Twice\".... \n";
 for ( i = 0 ; i < 3 ; i++ )
	 cout << a[i] <<"\n";

 return 0;
}                               


// The following is the result of compilation
//Compilation successful

// The following is the result of running the program

/*
 This is the array before applying "Twice"....
4
5
7

 This is the array after applying "Twice"....
8
5
14
*/