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From: Stefan Monnier <monnier@iro.umontreal.ca>
To: merlyn@stonehenge.com (Randal L. Schwartz)
Cc: "Lennart Borgman \(gmail\)" <lennart.borgman@gmail.com>,
	emacs-devel@gnu.org
Subject: Re: In CVS Emacs, calc-eval gives multiplication higher  precidence  than division
Date: Sun, 07 Sep 2008 17:10:05 -0400	[thread overview]
Message-ID: <jwv7i9nzn4o.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <86sksb3d53.fsf@blue.stonehenge.com> (Randal L. Schwartz's message of "Sun, 07 Sep 2008 13:38:16 -0700")

> You parse
>     a b / c d
> as ((a * b) / c) * d ?

"a b / c d" is completely different from "a * b / c * d"
w.r.t. precedence.  And so is "a * b ÷ c * d" or "a × b ÷ c × d".
There's no good reason why they necessarily all three get
parsed identically.

As it so happens, Calc is the only tool I know which parses
"a * b / c * d" differently than "((a * b) / c) * d".  So whether it
makes sense or not doesn't really matter, because the other way to parse
it also makes sense and has the benefit of agreeing with the world
out there.


        Stefan




  parent reply	other threads:[~2008-09-07 21:10 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-09-07 16:06 In CVS Emacs, calc-eval gives multiplication higher precidence than division Francis Litterio
2008-09-07 16:37 ` Jay Belanger
2008-09-07 18:15   ` Francis Litterio
2008-09-07 19:46   ` Stefan Monnier
2008-09-07 20:19     ` bug#920: " Lennart Borgman (gmail)
2008-09-07 20:32     ` Randal L. Schwartz
2008-09-07 20:34       ` Lennart Borgman (gmail)
2008-09-07 20:38         ` Randal L. Schwartz
2008-09-07 20:42           ` Lennart Borgman (gmail)
2008-09-07 20:50             ` Randal L. Schwartz
2008-09-07 21:07               ` Lennart Borgman (gmail)
2008-09-08  6:39                 ` Ulrich Mueller
2008-09-08  7:07                   ` Lennart Borgman (gmail)
2008-09-07 21:10               ` Stefan Monnier
2008-09-07 23:30                 ` Jay Belanger
2008-09-08  0:50               ` Jason Rumney
2008-09-08  1:13             ` Randal L. Schwartz
2008-09-08  3:47               ` Stefan Monnier
2008-09-08  8:48                 ` Miles Bader
2008-09-08 12:59                   ` Stefan Monnier
2008-09-08 13:29                   ` martin rudalics
2008-09-08  7:26               ` Lennart Borgman (gmail)
2008-09-07 21:10           ` Stefan Monnier [this message]
2008-09-08 10:30       ` Carsten Dominik
2008-09-08 11:01         ` Lennart Borgman
2008-09-08 20:33           ` Carsten Dominik
2008-09-08 20:39             ` Lennart Borgman (gmail)
2008-09-08 20:43               ` Randal L. Schwartz
2008-09-08 20:53                 ` bug#914: " Lennart Borgman (gmail)
2008-09-08 20:53                 ` Lennart Borgman (gmail)
2008-09-08 22:59                   ` bug#914: " Jay Belanger
2008-09-08 23:44                     ` Lennart Borgman (gmail)
2008-09-09 13:28                     ` Stefan Monnier
2008-09-09 14:36                       ` Francis Litterio
2008-09-09 16:26                         ` Ulrich Mueller
2008-09-09 16:41                           ` Lennart Borgman (gmail)
2008-09-30  4:10                         ` Leo
2008-09-08 21:42                 ` Stefan Monnier
2008-09-09  8:11                 ` Richard M. Stallman
2008-09-09 13:26                   ` Stefan Monnier
2008-09-09 17:03                     ` Lennart Borgman (gmail)
2008-09-09 17:19                       ` Stefan Monnier
2008-09-08 13:01         ` Stefan Monnier
2008-09-07 20:35     ` Jay Belanger
2008-09-07 21:15       ` Stefan Monnier
2008-09-07 21:19         ` Lennart Borgman (gmail)

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