#include <iostream>

using namespace std;



void f(int *j); // f() declares a pointer parameter
void af(int *j);


int main()

{

  int i = 0;
  int a[15];
  a[2] = 0;
  int *p;

  int *ap;


  p = &i; // p now points to i
  ap = &a[2];


  f(p); // pass a pointer
  af(ap);

  cout << "\n";
  cout << "i = " << i;  // i is now 100
  cout << "\n";
  cout << "a[2] = " << a[2];
  cout << "\n";

  return 0;

}



// f() receives a pointer to an int.

void f(int *j)

{

  *j = 100; // var pointed to b

}


void af(int *j)
{
        *j = 42;
}