Path: utzoo!mnetor!uunet!husc6!mit-eddie!uw-beaver!ssc-vax!cxsea!blm
From: blm@cxsea.UUCP (Brian Matthews)
Newsgroups: comp.lang.c
Subject: Re: "logical" xor
Message-ID: <2325@cxsea.UUCP>
Date: 11 Jan 88 16:52:13 GMT
References: <2946@zeus.TEK.COM>
Reply-To: blm@cxsea.UUCP (Brian Matthews)
Organization: Computer X Inc.
Lines: 22

Dan Tilque (dant@tekla.UUCP) writes:
|Doug Gwyn writes:
|>>>      a ^^ b
|>>I think this is about as good a notation as we can get [for exponentiation]
|>
|>However, as Karl pointer out, this would make a good logical exclusive-or
|>operator also, and I can see that the "strong argument" for exponentiation
|>would also apply, somewhat more weakly, to exclusive-or, which I've often
|>needed and have had to kludge ((a != 0) ^ (b != 0)).
|It's not really a kludge so you can stop thinking of as such.  It is a bit
|verbose but you can just use (a ^ b) and it will do the same thing (*).

No it won't.  Consider a == 1 and b == 2.  (a ^^ b) will result in 0,
(a ^ b) will result in 3, which aren't quite the same thing.  And, as
you point out later, (a ^ b) probably doesn't give anywhere near the
expected results that (a ^^ b) give when a and b are float types.

-- 
Brian L. Matthews                               "A power tool is not a toy.
...{mnetor,uw-beaver!ssc-vax}!cxsea!blm          Unix is a power tool."
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