X-Recipient:	archive-cygwin AT delorie DOT com
X-Spam-Check-By:	sourceware.org
Date:	Mon, 7 Mar 2011 11:45:10 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: 1.7.8: Fortran I/O rounding inaccuracy
Message-ID:	<20110307104510.GM6393@calimero.vinschen.de>
Reply-To:	cygwin AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
References:	<AANLkTinwzNz4X8btcrjVm+3Lxp_30iqr4FkuB1U=rrr6 AT mail DOT gmail DOT com>
MIME-Version:	1.0
In-Reply-To:	<AANLkTinwzNz4X8btcrjVm+3Lxp_30iqr4FkuB1U=rrr6@mail.gmail.com>
User-Agent:	Mutt/1.5.21 (2010-09-15)
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
List-Unsubscribe:	<mailto:cygwin-unsubscribe-archive-cygwin=delorie DOT com AT cygwin DOT com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com

On Mar  7 10:39, Thomas Henlich wrote:
> Hi,
> 
> I found the following bug in cygwin 1.7.8 on Windows XP:
> 
> Fortran I/O rounding truncates the result after a certain number of
> digits. The following program:
> ===
> write(*, '(f35.32)') 0.14285714285714285d0
> end
> ===
> gives this output:
>  0.14285714285714284921269000000000
> The expected output is:
>  0.14285714285714284921269268124888
> [...]
> The problem seems limited to the Fortran language, because the C call
> printf("%35.32f\n", 0.14285714285714285) prints the expected result:
>  0.14285714285714284921269268124888

So it's not a Cygwin bug after all.  It's a bug in the GNU fortran
compiler or one of its libraries.  You should ask about this in a GNU
fortran mailing list, perhaps.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple

- Raw text -