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From: jss@sjuvax.UUCP (J. Shapiro)
Newsgroups: net.lang.c
Subject: Re: <=> and obfuscation
Message-ID: <856@sjuvax.UUCP>
Date: Sat, 16-Feb-85 03:35:47 EST
Article-I.D.: sjuvax.856
Posted: Sat Feb 16 03:35:47 1985
Date-Received: Mon, 18-Feb-85 06:37:29 EST
References: <7699@brl-tgr.ARPA> <1293@bbncca.ARPA> <7853@brl-tgr.ARPA> <805@sjuvax.UUCP> <11927@gatech.UUCP>, <856@houxf.UUCP>
Organization: Saint Josephs Univ. Phila., Pa.
Lines: 19

[Aren't you hungry..?]

> People have been arguing about the statement that
> 	b ^= a ^= b ^= a;
> gives 0 when a and b are the same.  However, you've misunderstood the
> original statement - the problem is not when a and b have the same VALUE, 
> but when they have the same ADDRESS. 
> -- 
> Bill Stewart	ho95c!wcs AT&T Bell Labs, Holmdel NJ
> HO 4K-435 x0705   (201-949-0705)
> {allegra, ucbvax!ihnp4, decvax!harpo}!houxf!stewart

I might suggest that if you are foolish enough to try to swap a and b where
&a == &b, you deserve what you get... There *is* a certain poetic justice 
to it. ;-)


Jon Shapiro
Haverford College