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From: TGMIKEY%CALSTATE.BITNET@wiscvm.wisc.EDU (Account Manager)
Newsgroups: comp.lang.c
Subject: RE: Re: How can I use #define to make something completely disappear?
Message-ID: <10320@brl-adm.ARPA>
Date: Fri, 13-Nov-87 13:56:16 EST
Article-I.D.: brl-adm.10320
Posted: Fri Nov 13 13:56:16 1987
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Comment: 10 Nov 87 05:05:16 PST
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From:     ljz@fxgrp.uucp
Subject:  Re: How can I use #define to make something completely disappear?
Comments: To: info-c@brl-smoke.arpa
To:       TGMIKEY@CCS.CSUSCC.CALSTATE.EDU

In article <10083@brl-adm.ARPA> ultra!wayne@ames.arpa (Wayne Hathaway) writes:
>
>Anybody got any suggestions? [ about how to conditionally comment out printf]

How 'bout ...

#ifdef DEBUG
# define D(X)    X
#else
# define D(X)
#endif

Then, in your program you can have ...

        D(printf("%s %s %d %d %g\n", foo, bar, baz, furd, farkle));

The double parens are a bit unaesthetic to me, but this gets the job done.

Another variation ...

#ifdef DEBUG
# define dprintf(X)    printf X
#else
# define dprintf(X)
#endif

Then, in your program ...

    dprintf(("%s %s %d %d %g\n", foo, bar, baz, furd, farkle));

More double parens, but it works.

You can get fancy with if statements, testing of debug flags, etc., but I
think you get the idea.

--
Lloyd Zusman, Master Byte Software, Los Gatos, California
"We take things well in hand."
..!ames!fxgrp!ljz

===== Reply from Mike Khosraviani <TGMIKEY> ==========================

We are trying to get rid of paranthesis (C is not considered an artificial
language program yet)  LISP uses them enought, thank you!!!!

If you wonder if I have any better suggestions or NOT, the answer is NOT!!!!
So, I guess we have to put up with those ('s.


Mike