Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!rutgers!usc!elroy.jpl.nasa.gov!cit-vax!wen-king
From: wen-king@cit-vax.Caltech.Edu (King Su)
Newsgroups: comp.lang.c
Subject: Re: use of if (!cptr) and if (cptr), where cptr is a *
Keywords: * != int
Message-ID: <11310@cit-vax.Caltech.Edu>
Date: 19 Jul 89 03:48:00 GMT
References: <10099@mpx2.mpx.com> <93@microsoft.UUCP>
Reply-To: wen-king@cit-vax.UUCP (Wen-King Su)
Organization: California Institute of Technology
Lines: 18

In article <93@microsoft.UUCP> paulc@microsoft.UUCP (Paul Canniff 2/1011) writes:
<In article <10099@mpx2.mpx.com> erik@mpx2.mpx.com (Erik Murrey) writes:
>>Would (!sptr) break anywhere?  Should it be discouraged?
<
>It will break if NULL != 0.  This is rare in my experience.  In fact

>This was from a *style* guide?  Yeah I suppose it works, though I am
<too lazy to check if the comma operator has a guaranteed order of
 ^^^^^^^^^^^^^^^^^
>evaluation.  I seldom use it.

Why do you bother to post anyway?  The (!sptr) will never break and the
comma operator do guarantee the order of evaluation.

-- 
/*------------------------------------------------------------------------*\
| Wen-King Su  wen-king@vlsi.caltech.edu  Caltech Corp of Cosmic Engineers |
\*------------------------------------------------------------------------*/