X-Recipient: archive-cygwin AT delorie DOT com
X-SWARE-Spam-Status: No, hits=-3.5 required=5.0	tests=AWL,BAYES_40,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,KHOP_RCVD_TRUST,RCVD_IN_DNSWL_LOW,RCVD_IN_HOSTKARMA_YE
X-Spam-Check-By: sourceware.org
Message-ID: <DFF9A312BD064EE8916D4AFB1288E369@PPPHP>
From: "Paul Edwards" <mutazilah AT gmail DOT com>
To: <cygwin AT cygwin DOT com>
Subject: gcc -ansi produces unexpected floating point result
Date: Fri, 7 Dec 2012 18:04:44 +1100
MIME-Version: 1.0
Content-Type: text/plain;	format=flowed;	charset="iso-8859-1";	reply-type=original
Content-Transfer-Encoding: 7bit
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id: <cygwin.cygwin.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

/* This program demonstrates a presumed bug in gcc 3.4.4 shipped
   with cygwin.

   If compiled with gcc -mno-cygwin -ansi, it prints:

C:\devel\bwbasic>gcc -mno-cygwin -ansi zatest.c

C:\devel\bwbasic>a
0.000000
2.000000

   Instead of the expected 2.000000 for the first line, and undefined
   for the second line.

   Without -ansi it produces a good result.

*/

#include <stdio.h>

int main(void)
{
    double x = 2.0;

    printf("%lf\n", x);
    printf("%f\n", x);
    return (0);
}


--
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