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From: hutch@sdcsvax.UUCP (Jim Hutchison)
Newsgroups: net.lang.c
Subject: Re: Boolean Operators Slighted in C
Message-ID: <1776@sdcsvax.UUCP>
Date: Mon, 12-May-86 13:42:09 EDT
Article-I.D.: sdcsvax.1776
Posted: Mon May 12 13:42:09 1986
Date-Received: Wed, 14-May-86 22:08:26 EDT
References: <838@ihwpt.UUCP> <778@bentley.UUCP>
Reply-To: hutch@sdcsvax.UUCP (Jim Hutchison)
Organization: UCSD EMU Project (Educational Microcomputer Unix)
Lines: 31

()

well now for ||= you can use |= because C defines 0 as false and non-0
as true (Yes, I know that boolean expressions are defined to return 0/1
as defined in K&R if that is still used).

typedef char bool;

#define B_TRUE	((bool)1)
#define B_FALSE	((bool)0)

bool a, b;

		a = B_TRUE;
		b = (x == READY);
		...
		b |= (x == READY);
		b ^= a;

Now this can get you into trouble, because 2 and 1 and 47 are also
"true".  This is o.k. for '|' but not '^'.

You could of course do

		b = (b == 0) ^ (a == 0)

but that looks a bit strained.
-- 
/*	Jim Hutchison	UUCP:	{dcdwest,ucbvax}!sdcsvax!hutch
			ARPA:	Hutch@sdcsvax.ucsd.edu
		    [ Disclaimer eaten by a passing kiwi ]	 */