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From: ok@goanna.cs.rmit.oz.au (Richard A. O'Keefe)
Newsgroups: comp.lang.c
Subject: Re: TRUE and FALSE
Message-ID: <3712@goanna.cs.rmit.oz.au>
Date: 9 Sep 90 12:34:32 GMT
References: <11215@alice.UUCP> <514@demott.COM> <2316@cirrusl.UUCP> <728@tetrauk.UUCP>
Organization: Comp Sci, RMIT, Melbourne, Australia
Lines: 18

>In article <F4u9._?1@cs.psu.edu>, flee@guardian.cs.psu.edu (Felix Lee) writes:
> Personally, I use this set of macros:
> #define CNAND(a,b)	(!((a)&&(b)))

Surely this was a joke?

In article <728@tetrauk.UUCP>, simons@tetrauk.UUCP (Simon Shaw) writes:
> IMHO, the compounds NOR and NAND, while much more useful if constructing 
> electronic circuitry, are considerably less clear in code (Not to mention
> XNOR, which even now takes me a few seconds to work out).

What's in a name?  XNOR(a,b) is just !!(a) == !!(b), true when a and b
have the same "truth value", false when they differ.  It's available in
Fortran under the name .EQV., in Algol 60 under the name %equiv, and in
Pascal and Ada under the name '='.  Rename XNOR() to BoolEqual() and it
is pretty easy to figure out.
-- 
Psychiatry is not about cure.  Psychiatry is about power.