Path: utzoo!attcan!uunet!husc6!endor!singer
From: singer@endor.harvard.edu (Rich Siegel)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Pointer Subtraction in THINK C 3.0
Message-ID: <5094@husc6.harvard.edu>
Date: 8 Aug 88 03:07:22 GMT
References: <63033@sun.uucp>
Sender: news@husc6.harvard.edu
Reply-To: singer@endor.UUCP (Rich Siegel)
Organization: Symantec/THINK Technologies, Bedford, MA
Lines: 23

In article <63033@sun.uucp> swilson@sun.UUCP () writes:

>It looks as though THINK C 3.0 is using long as the resulting type for
>pointer subtraction.  (A long gets pushed on the stack instead
>of an int, its upper two bytes are zero so printi prints 0.)

	Right. Though I'm not  a C god, my guess is that pointers are
treated as longs in that the difference of two pointers is a pointer,
not an int.

	The solution? Either cast the result, or use prototypes.

		--Rich




Rich Siegel
Quality Assurance Technician
THINK Technologies Division, Symantec Corp.
Internet: singer@endor.harvard.edu
UUCP: ..harvard!endor!singer
Phone: (617) 275-4800 x305