Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!gem.mps.ohio-state.edu!usc!hacgate!aic!howard
From: howard@aic.dpl.scg.hac.com (Mike Howard (213)317-5690)
Newsgroups: comp.lang.c
Subject: Re: __LINE__ and __FILE__ -- a beginner's question
Summary: A debugging use of _LINE_ and _FILE_ macros
Keywords: LINE FILE debugging
Message-ID: <5526@hacgate.UUCP>
Date: 12 Oct 89 23:17:24 GMT
References: <6257@arcturus>
Sender: news@hacgate.UUCP
Reply-To: howard@aic.hrl.hac.com (Mike Howard)
Organization: Hughes Research Labs, Malibu, CA
Lines: 14

In article <6257@arcturus> evil@arcturus.UUCP (Wade Guthrie) writes:
>For what purpose are the __LINE__ and __FILE__ macros used? 
>... is there some use for the applications programmer?

I saw this in some programming article as a debugging usage, though
I've never used it:

#ifdef DEBUG
#define DTRACE(var) fprintf(stderr, "%s:%d, var=%d\n",__FILE__,__LINE__,var)
#else
#define DTRACE(var)
#endif

Mike Howard  howard@aic.hrl.hac.com