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From: chris@mimsy.UUCP (Chris Torek)
Newsgroups: comp.lang.c
Subject: Re: How can I use #define to make something completely disappear?
Message-ID: <9187@mimsy.UUCP>
Date: Sat, 31-Oct-87 22:23:47 EST
Article-I.D.: mimsy.9187
Posted: Sat Oct 31 22:23:47 1987
Date-Received: Thu, 5-Nov-87 05:48:49 EST
References: <10083@brl-adm.ARPA> <850@tut.cis.ohio-state.edu>
Organization: U of Maryland, Dept. of Computer Science, Coll. Pk., MD 20742
Lines: 22

In article <850@tut.cis.ohio-state.edu> lvc@tut.cis.ohio-state.edu
(Lawrence V. Cipriani) writes:
>... I also added a command line option, say -d, so that even if DEBUG
>was defined you needed -d to get the printfs. ...
>
>#define DBPRINT(arglist) if (dflag != 0) printf arglist

I suggest instead

#define	DBPRINT(arglist) if (dflag == 0) /* void */; else printf arglist

so that you can use, e.g.,

	if (it was minor)
		DBPRINT((...));
	else
		abort(...);

without having the `else' wind in up the wrong place.
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7690)
Domain:	chris@mimsy.umd.edu	Path:	uunet!mimsy!chris