// Fig. 8.13: fig08_13.cpp
// Attempting to modify a constant pointer to nonconstant data.

int main()
{
   int x, 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; // const pointer must be initialized

   *ptr = 7; // allowed: *ptr is not const
   ptr = &y; // error: ptr is const; cannot assign to it a new address
   return 0; // indicates successful termination
} // end main

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