Re: Why no logical XOR operator

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Article #1687

#1687

From: Henry Spencer
Date: Thu, 13 Sep 1990 15:54

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In article <1990Sep12.154515.18460@druid.uucp> darcy@druid.uucp (D'Arcy J.M. Cain) writes:
>	if (x ^^ (y & z))
>
>If there was such a thing as a '^^' operator.  Does anyone know why C left
>out the logical XOR operator?

Try `!x != !(y & z)', which gets the same results; if the operands are
booleans to begin with, you can leave out the unary !s.

"^^" is a perennial suggestion which really has very little to recommend
it.  It can't short-circuit like && and ||, because XOR has to evaluate
both operands.  And it would be useful rather rarely.
-- 
TCP/IP: handling tomorrow's loads today| Henry Spencer at U of Toronto Zoology
OSI: handling yesterday's loads someday|  henry@zoo.toronto.edu   utzoo!henry

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Message-ID: <1990Sep13.155424.19104@zoo.toronto.edu>

Path: arc1-ca.pugleaf.net!utzoo!henry

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Newsgroups: comp.std.c
Path: arc1-ca.pugleaf.net!utzoo!henry
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: Why no logical XOR operator
Message-ID: <1990Sep13.155424.19104@zoo.toronto.edu>
Organization: U of Toronto Zoology
References: <1990Sep12.154515.18460@druid.uucp>
Date: Thu, 13 Sep 90 15:54:24 GMT

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