/* Fig. 7.13: fig07_13.c
   Attempting to modify a constant pointer to non-constant data */
#include <stdio.h>

int main()
{
   int x; /* define x */
   int y; /* define y */

   /* ptr is a constant pointer to an integer that can be modified
      through ptr, but ptr always points to the same memory location */
   int * const ptr = &x; 

   *ptr = 7; /* allowed: *ptr is not const */
   ptr = &y; /* error: ptr is const; cannot assign new address */

   return 0; /* indicates successful termination */

} /* end main */



/**************************************************************************
 * (C) Copyright 1992-2004 by Deitel & Associates, Inc. and               *
 * Pearson Education, Inc. All Rights Reserved.                           *
 *                                                                        *
 * DISCLAIMER: The authors and publisher of this book have used their     *
 * best efforts in preparing the book. These efforts include the          *
 * development, research, and testing of the theories and programs        *
 * to determine their effectiveness. The authors and publisher make       *
 * no warranty of any kind, expressed or implied, with regard to these    *
 * programs or to the documentation contained in these books. The authors *
 * and publisher shall not be liable in any event for incidental or       *
 * consequential damages in connection with, or arising out of, the       *
 * furnishing, performance, or use of these programs.                     *
 *************************************************************************/