Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!mailrus!uflorida!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: <10748@smoke.BRL.MIL> Date: 16 Aug 89 04:27:07 GMT References: <1043@levels.sait.edu.au> <828@ruso.UUCP> Reply-To: gwyn@brl.arpa (Doug Gwyn) Organization: Ballistic Research Lab (BRL), APG, MD. Lines: 7 In article <828@ruso.UUCP> wolfgang@ruso.UUCP (Wolfgang Deifel) writes: >it will return (char*)0 ( regardless of the machine or the compiler ), >and here it's legal to add '1' ( the result is (char*)1 ). What is this, a time-shift phenomenon? We keep getting a sprinkling of articles making this incorrect claim. It is NOT legal to perform arithmetic on a null pointer.