From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg Newsgroups: gmane.emacs.help Subject: Re: problems of everyday life Date: Wed, 16 Nov 2022 21:39:05 +0100 Message-ID: <87sfii63di.fsf@dataswamp.org> References: <87r0y4w8hy.fsf@dataswamp.org> <86v8nfuyl6.fsf@mail.linkov.net> <87sfijf6b5.fsf@disroot.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="36641"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:EkY/h5Pb3lfFwxwiUvVOXKfnuYY= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Nov 18 14:49:58 2022 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 1ow1kk-0009LJ-8O for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 18 Nov 2022 14:49:58 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ow1kJ-0002L0-68; Fri, 18 Nov 2022 08:49:31 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ovPBj-00021B-NG for help-gnu-emacs@gnu.org; Wed, 16 Nov 2022 15:39:15 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ovPBi-00030z-4T for help-gnu-emacs@gnu.org; Wed, 16 Nov 2022 15:39:15 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1ovPBf-0008X6-NF for help-gnu-emacs@gnu.org; Wed, 16 Nov 2022 21:39:11 +0100 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: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Fri, 18 Nov 2022 08:49:29 -0500 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.29 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-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.help:141037 Archived-At: Akib Azmain Turja wrote: > Someone implemented addition using sleep. Now I have implemented > subtraction: > > (defun subtract (x y) > (when (< y x) > (let ((tmp x)) > (setq x y) > (setq y tmp))) > (let ((time-a (current-time))) > (sleep-for x) > (let ((time-b (current-time))) > (while (< (float-time (time-subtract nil time-a)) y) > (sleep-for 0.9)) > (floor (float-time (time-subtract nil time-b)))))) > > (subtract 0 1) ; => 1 > (subtract 3 5) ; => 2 What about recursive counting? (defun recursive-count (n) (if (zerop n) 0 (1+ (recursive-count (1- n))) )) (recursive-count 5) ; 5 -- underground experts united https://dataswamp.org/~incal