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From: mesans@uvicctr.UUCP (mesans)
Newsgroups: net.lang.c
Subject: Re: Boolean Operators Slighted in C
Message-ID: <167@uvicctr.UUCP>
Date: Tue, 13-May-86 23:52:38 EDT
Article-I.D.: uvicctr.167
Posted: Tue May 13 23:52:38 1986
Date-Received: Tue, 20-May-86 06:17:23 EDT
References: <838@ihwpt.UUCP> <778@bentley.UUCP> <210@sdchema.sdchem.UUCP> <1305@umcp-cs.UUCP>
Reply-To: mesans@uvicctr.UUCP ()
Organization: University of Victoria, Victoria B.C. Canada
Lines: 17

>>Not quite the same.
>>	3 ^^ 4
>>would evaluate as 0,
>>	3 != 4
>>evaluates as 1.
>
>If the left and right hand sides are both already boolean, `!=' works;
>but the following macro always works:
>
>	/* logical exclusive or */
>	#define lxor(a, b)	(((a) != 0) != ((b) != 0))
  Which is equivalent to :
               !a != !b
     which I think you will agree is much simpler, and easyer to
  understand (at least I think so).

      S. John Banner