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From: ron@brl-sem.UUCP
Newsgroups: net.lang.c
Subject: Re: #if foo vs #if defined(foo)
Message-ID: <344@brl-sem.ARPA>
Date: Sat, 12-Jul-86 15:10:37 EDT
Article-I.D.: brl-sem.344
Posted: Sat Jul 12 15:10:37 1986
Date-Received: Sat, 12-Jul-86 23:12:49 EDT
References: <1586@brl-smoke.ARPA> <379@twitch.UUCP>
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 17
Keywords: Sys 5.2

In article <379@twitch.UUCP>, grt@twitch.UUCP ( G.R.Tomasevich) writes:
> Our compiler does not need a defined(), or at least I did not try whether
> it is even accepted.  The following example works fine:
> 
> #if squat||foo

Consider an optionally included definition

#define	SQUAT	0

If your code really wanted to check for this then the proper
test would be

#if defined(SQUAT) && (squat == 0)

to differentiate between undefined SQUAT and SQUAT defined but
equal to zero.