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From: gwyn@smoke.BRL.MIL (Doug Gwyn)
Newsgroups: comp.lang.c
Subject: Re: use of if (!cptr) and if (cptr) && a programming error
Message-ID: <10643@smoke.BRL.MIL>
Date: 1 Aug 89 21:19:36 GMT
References: <10099@mpx2.mpx.com> <93@microsoft.UUCP> <10100@mpx2.mpx.com> <2990@nmtsun.nmt.edu> <18677@mimsy.UUCP> <10592@riks.csl.sony.JUNET>
Reply-To: gwyn@brl.arpa (Doug Gwyn)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 7

In article <10592@riks.csl.sony.JUNET> diamond@riks. (Norman Diamond) writes:
>But!  What about the following famous idiom!
>    while ((ch = getchar()) != EOF) { ... }
>The old value of ch might be compared to EOF?

No -- however, EOF may be evaluated before ch is set to what getchar()
returns (before the comparison of the new value of ch against EOF).