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From: karl@haddock.ISC.COM (Karl Heuer)
Newsgroups: comp.lang.c
Subject: Re: Comparing chars to constants
Message-ID: <1509@haddock.ISC.COM>
Date: Mon, 26-Oct-87 21:11:14 EST
Article-I.D.: haddock.1509
Posted: Mon Oct 26 21:11:14 1987
Date-Received: Thu, 29-Oct-87 05:01:39 EST
References: <4663@elroy.Jpl.Nasa.Gov> <2515@mmintl.UUCP>
Reply-To: karl@haddock.ima.isc.com (Karl Heuer)
Organization: Interactive Systems, Boston
Lines: 10

In article <2515@mmintl.UUCP> franka@mmintl.UUCP (Frank Adams) writes:
>In article <4663@elroy.Jpl.Nasa.Gov> david@elroy.Jpl.Nasa.Gov (David Robinson) writes:
>	if (p == 0x80u)
>This will coerce p to unsigned.

Yes it will, but that doesn't give you the right answer.  If p is a (signed)
char containing 0x80, the left side is (unsigned)(int)p which is 0xffffff80U,
not 0x00000080U.

Karl W. Z. Heuer (ima!haddock!karl or karl@haddock.isc.com), The Walking Lint