From: Joost Kremers <joostkremers@fastmail.fm>
To: Emanuel Berg via Users list for the GNU Emacs text editor
<help-gnu-emacs@gnu.org>
Subject: Re: (- 2.8 1.6) ; 1.1999999999999997
Date: Mon, 10 Feb 2020 22:33:52 +0100 [thread overview]
Message-ID: <877e0urutb.fsf@fastmail.fm> (raw)
In-Reply-To: <8736biywcn.fsf@ebih.ebihd>
On Mon, Feb 10 2020, Emanuel Berg via Users list for the GNU Emacs
text editor wrote:
> What's this?
>
> (- 2.8 1.6) ; 1.1999999999999997
>
> With the TI-84 Plus,
>
> 2.8-1.6=1.2
>
> Normally I'm all pro-Lisp but here...
>
> Actually zsh also reports
>
> echo $(( 2.8 - 1.6 )) # 1.1999999999999997
joost@Swift:~$ clojure
Clojure 1.9.0
user=> (- 2.8 1.6)
1.1999999999999997
user=> (+ 0.1 0.2)
0.30000000000000004
user=> <C-d>
joost@Swift:~$ python
Python 2.7.17 (default, Nov 7 2019, 10:07:09)
[GCC 7.4.0] on linux2
Type "help", "copyright", "credits" or "license" for more
information.
>>> 2.8 - 1.6
1.1999999999999997
>>> 0.1 + 0.2
0.30000000000000004
>>> <C-d>
joost@Swift:~$
> so perhaps some CPU (ALU) thing?
It's a binary thing, and it's well-known:
https://floating-point-gui.de/
--
Joost Kremers
Life has its moments
next prev parent reply other threads:[~2020-02-10 21:33 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-10 21:18 (- 2.8 1.6) ; 1.1999999999999997 Emanuel Berg via Users list for the GNU Emacs text editor
2020-02-10 21:31 ` tomas
2020-02-10 21:33 ` Joost Kremers [this message]
2020-02-10 23:10 ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-02-11 1:31 ` Stefan Monnier
2020-02-11 1:50 ` Alexandre François Garreau
2020-02-11 1:55 ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-04-07 14:00 ` Bruno Félix Rezende Ribeiro
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