Path: utzoo!utgpu!watmath!att!tut.cis.ohio-state.edu!purdue!haven!adm!smoke!gwyn From: gwyn@smoke.BRL.MIL (Doug Gwyn) Newsgroups: comp.lang.c Subject: Re: "do ... while ((NULL + 1) - 1);" -- valid C? Message-ID: <10682@smoke.BRL.MIL> Date: 8 Aug 89 21:09:26 GMT References: <1043@levels.sait.edu.au> Reply-To: gwyn@brl.arpa (Doug Gwyn) Organization: Ballistic Research Lab (BRL), APG, MD. Lines: 8 In article <1043@levels.sait.edu.au> ccdn@levels.sait.edu.au (DAVID NEWALL) writes: -I've been told that this is not valid C because, in the case that there -are no more fields (commas), strchr() returns NULL; and NULL + 1 is not -valid. -Comments, anyone? You were told right. You're not allowed to perform pointer arithmetic involving null pointers.