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Mail Archives: djgpp-workers/2003/08/10/13:02:21

From: Kbwms AT aol DOT com
Message-ID: <50.20b0edc5.2c67d494@aol.com>
Date: Sun, 10 Aug 2003 13:02:12 EDT
Subject: Anomaly in printf()
To: djgpp-workers AT delorie DOT com
MIME-Version: 1.0
X-Mailer: 8.0 for Windows sub 6011
Reply-To: djgpp-workers AT delorie DOT com 

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The following program:

#include <stdio.h>
int
main(void)
{
    long double Demo = (unsigned long long)(-1);

    printf("Demo     = %.0Lf\n", Demo);
    printf("Demo - 1 = %.0Lf\n", Demo-1.0L);
    exit(0);
}

produces the following (erroneous second line of) output:

Demo       = 18446744073709551615
Demo - 1 = 18446744073709551613


Is this a known problem?

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<HTML><FONT FACE=3Darial,helvetica><FONT  SIZE=3D3 FAMILY=3D"SERIF" FACE=3D"=
Georgia" LANG=3D"0">The following program:<BR>
<BR>
#include &lt;stdio.h&gt;<BR>
int<BR>
main(void)<BR>
{<BR>
&nbsp;&nbsp;&nbsp; long double Demo =3D (unsigned long long)(-1);<BR>
<BR>
&nbsp;&nbsp;&nbsp; printf("Demo&nbsp;&nbsp;&nbsp;&nbsp; =3D %.0Lf\n", Demo);=
<BR>
&nbsp;&nbsp;&nbsp; printf("Demo - 1 =3D %.0Lf\n", Demo-1.0L);<BR>
&nbsp;&nbsp;&nbsp; exit(0);<BR>
}<BR>
<BR>
produces the following (erroneous second line of) output:<BR>
<BR>
Demo&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =3D 18446744073709551615<BR>
Demo - 1 =3D 18446744073709551613<BR>
<BR>
<BR>
Is this a known problem?</FONT></HTML>

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