#include <iostream.h>

void f( int *a )    // No special & symbol...
{
   cout << "Before update:  a = " << a << endl;
   cout << "Before update: *a = " << *a << endl << endl;

   *a = *a + 1;

   cout << "After update:  a = " << a << endl;
   cout << "After update: *a = " << *a << endl << endl;
}

int main(int argc, char *argv[])
{
   int x = 10;

   cout << "Main:  x = " << x << endl;
   cout << "Main: &x = " << &x << endl << endl;

   f( &x );     // Pass address of x

   cout << "Main:  x = " << x << endl;
   cout << "Main: &x = " << &x << endl << endl;
}