#include <stdio.h>
int main( void )
{
   int num = 12;
   int *numPtr;

   numPtr = &num; /* Now numPtr points to num. */
   printf( "num = %d, value of num using indirection is %d\n",
            num, *numPtr );
   printf( "address of num = %p, address held in numPtr = %p\n",
           &num, numPtr );
   printf( "The address of the pointer variable itself is %p\n",
           &numPtr );
   *numPtr = *numPtr + 1; /* now num holds 13 */
}