From mboxrd@z Thu Jan 1 00:00:00 1970 Path: main.gmane.org!not-for-mail From: Kevin Rodgers Newsgroups: gmane.emacs.devel Subject: Re: Strange division using mixed integers and floats Date: Wed, 28 Apr 2004 09:59:22 -0600 Sender: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Message-ID: <408FD4DA.30708@yahoo.com> References: NNTP-Posting-Host: deer.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Trace: sea.gmane.org 1083168758 19323 80.91.224.253 (28 Apr 2004 16:12:38 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Wed, 28 Apr 2004 16:12:38 +0000 (UTC) Original-X-From: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Wed Apr 28 18:12:19 2004 Return-path: Original-Received: from quimby.gnus.org ([80.91.224.244]) by deer.gmane.org with esmtp (Exim 3.35 #1 (Debian)) id 1BIrfX-0005pa-00 for ; Wed, 28 Apr 2004 18:12:19 +0200 Original-Received: from monty-python.gnu.org ([199.232.76.173]) by quimby.gnus.org with esmtp (Exim 3.35 #1 (Debian)) id 1BIrfX-00080J-00 for ; Wed, 28 Apr 2004 18:12:19 +0200 Original-Received: from localhost ([127.0.0.1] helo=monty-python.gnu.org) by monty-python.gnu.org with esmtp (Exim 4.30) id 1BIrf9-0002cV-G0 for emacs-devel@quimby.gnus.org; Wed, 28 Apr 2004 12:11:55 -0400 Original-Received: from list by monty-python.gnu.org with tmda-scanned (Exim 4.30) id 1BIrbt-0001o3-EY for emacs-devel@gnu.org; Wed, 28 Apr 2004 12:08:33 -0400 Original-Received: from mail by monty-python.gnu.org with spam-scanned (Exim 4.30) id 1BIrSk-0000To-D0 for emacs-devel@gnu.org; Wed, 28 Apr 2004 11:59:37 -0400 Original-Received: from [80.91.224.249] (helo=main.gmane.org) by monty-python.gnu.org with esmtp (Exim 4.30) id 1BIrSj-0000Ss-4t for emacs-devel@gnu.org; Wed, 28 Apr 2004 11:59:05 -0400 Original-Received: from list by main.gmane.org with local (Exim 3.35 #1 (Debian)) id 1BIrSe-00063D-00 for ; Wed, 28 Apr 2004 17:59:00 +0200 Original-Received: from 170.207.51.80 ([170.207.51.80]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 28 Apr 2004 17:59:00 +0200 Original-Received: from ihs_4664 by 170.207.51.80 with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 28 Apr 2004 17:59:00 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-To: emacs-devel@gnu.org Original-Lines: 21 Original-X-Complaints-To: usenet@sea.gmane.org X-Gmane-NNTP-Posting-Host: 170.207.51.80 User-Agent: Mozilla/5.0 (X11; U; SunOS i86pc; en-US; rv:0.9.4.1) Gecko/20020406 Netscape6/6.2.2 X-Accept-Language: en-us X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.4 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Xref: main.gmane.org gmane.emacs.devel:22308 X-Report-Spam: http://spam.gmane.org/gmane.emacs.devel:22308 Andreas Schwab wrote: > David Kastrup writes: >>Also (/ 5 4 2.3) would no longer be equivalent to (/ (/ 5 4) 2.3). > > I don't think it was ever documented as such. The Emacs Lisp manual > only covers the case of all arguments being integers, but does not > specifically say anything about mixed mode arguments, except that a > floating point value is returned if any argument is floating. So > always using floating point arithmetics in this case would fit the > principle of least surprise. The manual says: | If there are additional arguments DIVISORS, then it divides DIVIDEND | by each divisor in turn. To me that means (/ 5 4 2.3) is equivalent to (/ (/ 5 4) 2.3). -- Kevin Rodgers