From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: What is 0.01 here not 0.01 here 0.009999999999999? Date: Fri, 16 Apr 2021 22:41:30 +0200 Message-ID: <87o8eehshx.fsf@zoho.eu> References: Reply-To: Emanuel Berg Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="37438"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:RO9M+LDxZD+wNLjOkprUjAMSHNo= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Apr 16 22:42:18 2021 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lXVI9-0009by-VG for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 16 Apr 2021 22:42:17 +0200 Original-Received: from localhost ([::1]:34432 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lXVI9-0008AQ-1W for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 16 Apr 2021 16:42:17 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:39554) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lXVHY-0008AK-OE for help-gnu-emacs@gnu.org; Fri, 16 Apr 2021 16:41:40 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:55740) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lXVHX-0004wf-6L for help-gnu-emacs@gnu.org; Fri, 16 Apr 2021 16:41:40 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1lXVHU-0008x1-F0 for help-gnu-emacs@gnu.org; Fri, 16 Apr 2021 22:41:36 +0200 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Mail-Copies-To: never Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:129012 Archived-At: Jean Louis wrote: > I would like to get a number increased for 0.01: > > (defun rcd-vc-increase-decimal-revision-number (nn.nn) > (let* ((nn.nn (format "%s" nn.nn)) > (nn.nn (format "%.2f" (string-to-number nn.nn))) > (nn.nn (string-to-number nn.nn))) > (+ nn.nn 0.01))) > > But result is not what I want, as I want to get 10.13, > though it is tiny loss: > > (rcd-vc-increase-decimal-revision-number "10.12") ; 10.129999999999999 Indeed, good question... It is a binary thing, how floats are implemented. Conventional wisdom is, it doesn't matter, don't worry about it. In your case, if you want a version number that is MAJOR.MINOR.PATCH what you can do is have them integer integer integer and then a separate function to output them (format "%d.%d.%d" major minor patch) I prefer to use the time of change for versions, but that's just me - and what a horrible world it would be, if everyone was the same - and for larger/join projects it should/could be extended, but still, check out: https://dataswamp.org/~incal/emacs-init/time-insert.el -- underground experts united https://dataswamp.org/~incal