Date: Sun, 31 Mar 96 03:53:40 +0100 From: Jean-Marc Zucconi <jmz@cabri.obs-besancon.fr> To: regnauld@tetard.frmug.fr.net Cc: current@freebsd.org Subject: Re: Weird atof() behavior Message-ID: <9603310253.AA18217@cabri.obs-besancon.fr> In-Reply-To: <199603301436.PAA13952@tetard.frmug.fr.net> (message from Philippe Regnauld on Sat, 30 Mar 1996 15:36:26 %2B0100 (MET))
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This is the correct behavior: non declared functions are assumed
returning int. You have to tell the compiler that atof() returns a
float.
Jean-Marc
>>>>> Philippe Regnauld writes:
> Hi,
> A friend of mine has had some problems with Rayshade running on
> 2.0.5 (GCC 2.6.3) -- it appeared that atof() systematically
> returned bogus values in certain conditions: if you omit to specify
> #include <stdlib.h>, gcc does NOT issue any sort of warning for
> atof(). Example:
> #include <stdio.h>
> main()
> {
> foo* char="3.1415926";
> float bar=atof(foo);
> printf("%f\n",bar);
> }
> Here's the output:
> -7.000000
> This is obviously a GCC related problem (I've got the same results
> with current), as testing with 2.5.8 showed no problems. It seems
> that the value from is cast to a double, then cast to an int.
> The warning does show up with -Wall:
> atof.c:5: warning: implicit declaration of function `atof'
> -- Phil
> --
> - [ regnauld@tetard.frmug.fr.net / +48.8N+2.3E / +33 1 4507 9391 / Sol 3 ] -
> - [ regnauld@freenix.fr / FreeBSD 2.x / ] -
> "Le schtroumpf est ` l'homme ce que le bleu est au billard" - F.Berjon
_____________________________________________________________________________
Jean-Marc Zucconi Observatoire de Besancon F 25010 Besancon cedex
PGP Key: finger jmz@cabri.obs-besancon.fr
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