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From: ekrell@hector.UUCP (Eduardo Krell)
Newsgroups: comp.unix.questions
Subject: Re: Brain-dead Unix tutor needs quick help (-1)
Message-ID: <3184@ulysses.homer.nj.att.com>
Date: Wed, 18-Nov-87 16:45:49 EST
Article-I.D.: ulysses.3184
Posted: Wed Nov 18 16:45:49 1987
Date-Received: Sat, 21-Nov-87 11:05:53 EST
References: <387@cogen.UUCP>
Sender: daemon@ulysses.homer.nj.att.com
Reply-To: ekrell@hector (Eduardo Krell)
Organization: AT&T Bell Labs, Murray Hill
Lines: 14
Keywords: I used to know the reason

In article <387@cogen.UUCP> alen@cogen.UUCP (Alen Shapiro) writes:

>#define XXX (-1)
>
>Please someone out in net-land, put me out of my mysery. Is there a potential
>confusion of unary minus with something else here?

what about an expression like "a-XXX" in your program? It will be converted
to "a--1" which doesn't look like legal C to me. On the other hand,
"a-(-1)" is OK.
    
    Eduardo Krell                   AT&T Bell Laboratories, Murray Hill

    {ihnp4,seismo,ucbvax}!ulysses!ekrell