On Apr 18, 2008, at 6:59 PM, John Chung wrote:
> I would like to add that pointers can only
> add/subtract the number of element from it's type

Hmm.  I too am pretty sure that you are allowed to subtract one  
pointer from another, as long as they're the same type, and you'll  
get an int.  After all, you can add an int to a pointer, and it  
certainly ought to be true that:

	(ptr + i) - (ptr) == i;

This college class page supports this (see "pointer subtaction"):

http://www.cs.umd.edu/class/spring2003/cmsc311/Notes/BitOp/pointer.html

BillW

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