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From: levy@ttrdc.UUCP (Daniel R. Levy)
Newsgroups: net.lang.c
Subject: Re: Boolean Operators Slighted in C
Message-ID: <880@ttrdc.UUCP>
Date: Sun, 11-May-86 18:27:43 EDT
Article-I.D.: ttrdc.880
Posted: Sun May 11 18:27:43 1986
Date-Received: Tue, 13-May-86 03:27:01 EDT
References: <838@ihwpt.UUCP> <778@bentley.UUCP> <210@sdchema.sdchem.UUCP> <732@steinmetz.UUCP>
Organization: AT&T, Computer Systems Division, Skokie, IL
Lines: 22

In article <732@steinmetz.UUCP>, davidsen@steinmetz.UUCP (Davidsen) writes:
>XOR can be defined as an (ugly) macro, I believe.
>
>#define XOR(a,b) (((a) != 0) != ((b) != 0)
>/* or if you like small better than readable */
>#define XOR(a,b) (!!(a) != !!(b))
>--
>	-bill davidsen

or even

#define XOR(a,b)	(!(a) != !(b))

since XOR(not-a,not-b) == XOR(a,b)
-- 
 -------------------------------    Disclaimer:  The views contained herein are
|       dan levy | yvel nad      |  my own and are not at all those of my em-
|         an engihacker @        |  ployer or the administrator of any computer
| at&t computer systems division |  upon which I may hack.
|        skokie, illinois        |
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