From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.3 required=5.0 tests=BAYES_00,INVALID_MSGID autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: fac41,9a0ff0bffdf63657 X-Google-Attributes: gidfac41,public X-Google-Thread: 1108a1,9a0ff0bffdf63657 X-Google-Attributes: gid1108a1,public X-Google-Thread: 103376,4b06f8f15f01a568 X-Google-Attributes: gid103376,public X-Google-Thread: f43e6,9a0ff0bffdf63657 X-Google-Attributes: gidf43e6,public From: doylep@ecf.toronto.edu (Patrick Doyle) Subject: Re: Software landmines (loops) Date: 1998/09/04 Message-ID: #1/1 X-Deja-AN: 387858091 X-Nntp-Posting-Host: spark23.ecf Sender: news@ecf.toronto.edu (News Administrator) References: <35f23ce2.7649859@news.erols.com> <6snn1b$c90$1@hirame.wwa.com> <35ef7dff.24318728@news.erols.com> Organization: University of Toronto, Engineering Computing Facility Newsgroups: comp.lang.eiffel,comp.object,comp.software-eng,comp.lang.ada Date: 1998-09-04T00:00:00+00:00 List-Id: In article <35ef7dff.24318728@news.erols.com>, Ell wrote: > >"Robert Martin" wrote: >> >>You had best define 'unstructured' in this context. Dijkstra's definition >>of 'unstructured control flow' is control flow that does not conform >>precisely to the four standard sequencing elements {sequence, selection, top >>exit loop, bottom exit loop}, all of which have a single entry and a single >>exit. > >Where is this documented? Where has Dijkstra stated that flow control >must conform precisely to the 4 specific elements you mention? I know >that sequence, selection, and *looping * are major appropriate flow >control elements, but please show where Dijkstra says that "top exit >loop" and "bottom exit loop" are, or should be standard flow control >elements. When Robert does so, do you promise to finally admit you're wrong? :-) -PD -- -- Patrick Doyle doylep@ecf.toronto.edu