Date: Thu, 16 Jan 2003 15:28:00 -0800 From: Kent Stewart <kstewart@owt.com> To: Ugen <ugen@xonix.com>, freebsd-questions@FreeBSD.ORG Subject: Re: printf prints WRONG double precision values Message-ID: <200301161528.00068.kstewart@owt.com> In-Reply-To: <3E272874.8060706@xonix.com> References: <3E272874.8060706@xonix.com>
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On Thursday 16 January 2003 01:47 pm, Ugen wrote:
> Try this:
>
> #include <stdio.h>
> int main()
> {
> double pi =3D 3.14159265358979323846 ;
>
> printf("%20.19f\n", pi);
> }
>
> and here is what you get:
> host: [16:45] [127] /tmp>./test
> 3.1415926535897931160
>
> The error in last 4 or digits is obvious. It seems
> that the culprit is __dtoa which incorrectly turns
> double precision numbers into strings.
> This is on FreeBSD 4.3 release..
>
> Ideas?
I thought that a 64-bit floating point was limited to around 16 digits.=20
That ends as ...793.
Kent
> --Ugen
>
>
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--=20
Kent Stewart
Richland, WA
http://users.owt.com/kstewart/index.html
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