From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg Newsgroups: gmane.emacs.help Subject: bike shifting - output decimal in percent Date: Sun, 19 May 2019 03:34:07 +0200 Message-ID: <86mujjrzw0.fsf@zoho.eu> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="15865"; mail-complaints-to="usenet@blaine.gmane.org" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Sun May 19 03:34:42 2019 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1hSAio-0003zy-4l for geh-help-gnu-emacs@m.gmane.org; Sun, 19 May 2019 03:34:42 +0200 Original-Received: from localhost ([127.0.0.1]:40797 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hSAim-0000df-OF for geh-help-gnu-emacs@m.gmane.org; Sat, 18 May 2019 21:34:40 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:44293) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hSAiP-0000bS-Vv for help-gnu-emacs@gnu.org; Sat, 18 May 2019 21:34:18 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hSAiO-0008J7-Vk for help-gnu-emacs@gnu.org; Sat, 18 May 2019 21:34:17 -0400 Original-Received: from [195.159.176.226] (port=51670 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hSAiO-0008IG-Oa for help-gnu-emacs@gnu.org; Sat, 18 May 2019 21:34:16 -0400 Original-Received: from list by blaine.gmane.org with local (Exim 4.89) (envelope-from ) id 1hSAiM-0003TR-B1 for help-gnu-emacs@gnu.org; Sun, 19 May 2019 03:34:14 +0200 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Mail-Copies-To: never Cancel-Lock: sha1:JBuPM0JtwoXGYlrys11/SAPYPc8= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 195.159.176.226 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.21 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.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.org gmane.emacs.help:120523 Archived-At: How do I output a decimal float digit 0 <= x <= 1 into percent? ("A percentage?" Correct English?) I asked at #emacs@irc.freenode.net and got the below answer, which, as you see, works fine. But I wonder if/why-not there is/isn't a built-in way to do it? Context: ;; thanks to friend at #emacs (defun percent-string (decimal) (concat (number-to-string (round (* 100 decimal)) ) "%") ) ;; test: (percent-string 0.42857142857142855) ; "43%" (defun bike-compute-step (from to) (percent-string (/ (- from to) from 1.0) )) ;; test - should be 43% for ;; one 42t and one 24t chainring ;; according to an article in the spring 2019 issue ;; of "Bicycle Quarterly" (ISSN 1941-8809) - ;; (bike-compute-step 42 24) ; "43%" Whole file: http://user.it.uu.se/~embe8573/emacs-init/bike.el -- underground experts united http://user.it.uu.se/~embe8573 https://dataswamp.org/~incal