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From: thornley@cs.umn.edu (David H. Thornley)
Newsgroups: comp.lang.c,comp.unix.wizards,alt.sources,comp.sources.d,misc.misc
Subject: Re: #define DEBUG... (using printf for debugging)
Message-ID: <1990May3.192347.12973@cs.umn.edu>
Date: 3 May 90 19:23:47 GMT
References: <11290@hoptoad.uucp> <40628@cornell.UUCP>
Organization: University of Minnesota, Minneapolis - CSCI Dept.
Lines: 24

In article <40628@cornell.UUCP> gordon@cs.cornell.edu (Jeffrey  Adam Gordon) writes:
>I want to have a DEBUG flag which controls whether diagnostic printfs
>are executed or not.
>
>The obvious way to do this is:
>
>#ifdef DEBUG
>	printf ("debugging information");
>#endif DEBUG

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

and 
D(printf("debugging information\n");)

If DEBUG is defined, anything in D() is used as is; if not, anything in
D() is disregarded.  It seems to work for me.

David Thornley