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Mail Archives: cygwin/2012/12/07/02:04:50

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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
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/* 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);
}


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