From: Thierry Volpiatto <thierry.volpiatto@gmail.com>
To: "Borde\, Andreas" <andreas.borde@jp.bosch.com>
Cc: help-gnu-emacs@gnu.org
Subject: Re: calculation error with built-in command CTRL + J?!
Date: Mon, 14 Apr 2008 08:24:28 +0200 [thread overview]
Message-ID: <87skxpdkdf.fsf@thievol.homelinux.org> (raw)
In-Reply-To: <ftukqh$tbi$1@news4.fe.internet.bosch.com> (Andreas Borde's message of "Mon, 14 Apr 2008 12:59:10 +0900")
"Borde, Andreas" <andreas.borde@jp.bosch.com> writes:
> Hello,
>
> I calculated
> (* 12 2.6) with the built in command CTRL + J and got
> 31.200000000000003
Hello, you have to use round like that:
,----
| ELISP> (/ (round (* 100
| (* 2.6 12)))
| 100.0)
| 31.2
`----
> It is the same for
> (* 2.6 12)
>
> I am wondering about the tailing numbers after 31.2!
>
> If I calculate (* 2.5 12) then the result is the expected 30.0.
>
> Can someone tell me the reason? Is there something wrong with
> my calcuation?
>
> I am using the official release:
>
> This is GNU Emacs 22.1.1 (i386-mingw-nt5.0.2195)
> of 2007-06-02 on RELEASE
>
> under Win2k.
>
> Thank you and kind regards
>
> Borde, Andreas
>
>
--
A + Thierry
Pub key: http://pgp.mit.edu
next prev parent reply other threads:[~2008-04-14 6:24 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-14 3:59 calculation error with built-in command CTRL + J?! Borde, Andreas
2008-04-14 6:11 ` David Hansen
2008-04-14 6:24 ` Thierry Volpiatto [this message]
2008-04-14 6:40 ` Sven Joachim
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