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From: fcy@iham1.UUCP (Fred Yankowski)
Newsgroups: net.lang.c
Subject: Re: Standard extensions (logical exclusive or)
Message-ID: <248@iham1.UUCP>
Date: Thu, 8-Nov-84 14:37:37 EST
Article-I.D.: iham1.248
Posted: Thu Nov  8 14:37:37 1984
Date-Received: Sat, 10-Nov-84 07:18:40 EST
References: <374@petsd.UUCP> <3081@alice.UUCP>
Organization: AT&T Bell Labs, Naperville, IL
Lines: 9

Although "A != B" does not work as a C implementation of logical-
exclusive-or, "!A != !B" (or "!!A == !B") does, since the '!'
operator has the effect of converting an integer into a "canonical"
boolean value:  zero or one (and negating the logical sense, of
course).  Logical equivalence for arbitrary integers can be
similarly defined by "!A == !B".


    Fred Yankowski ::: AT&T Bell Laboratories ::: ihnp4!iham1!fcy