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=0.2 required=5.0 tests=BAYES_00,INVALID_MSGID, REPLYTO_WITHOUT_TO_CC 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: f43e6,9a0ff0bffdf63657 X-Google-Attributes: gidf43e6,public X-Google-Thread: 103376,4b06f8f15f01a568 X-Google-Attributes: gid103376,public From: Martin@nezumi.demon.co.uk (Martin Tom Brown) Subject: Re: Software landmines (loops) Date: 1998/09/03 Message-ID: <904845414snz@nezumi.demon.co.uk>#1/1 X-Deja-AN: 387586826 References: <35f51e53.48044143@ X-Complaints-To: abuse@demon.net X-Mail2News-Path: news.demon.net!nezumi.demon.co.uk X-Trace: mail2news.demon.co.uk 904851605 mail2news:6841 mail2news mail2news.demon.co.uk Organization: Nezumi Reply-To: Martin@nezumi.demon.co.uk Newsgroups: comp.lang.eiffel,comp.object,comp.software-eng,comp.lang.ada Date: 1998-09-03T00:00:00+00:00 List-Id: On Thursday, in article doylep@ecf.toronto.edu "Patrick Doyle" wrote: > In article <35EDC648.76F03F32@draper.com>, > Tim McDermott wrote: > > > >This seems a little extreme to me. While I have great respect for > >combinatorial explosion, you are talking about a 3-term boolean expression. > >There are only 6 ways to put one of those together, and I have no trouble > >evaluating any of the forms. I know because I just listed them all, and ran > >through their evaluation with no problem. > Could you explain how you got the 6? > Maybe what you're talking about is these?... > > A + B + C > A & B + C > A &(B + C) > A + B & C > (A + B)& C > A & B & C > > However, these aren't really 6 distinct expressions. The third > and fifth are the same, as are the second and fourth. Are your sure about that ?? And what did B + A & C B &(A + C) Do to deserve being missed out ? And when you allow for the shortcircuiting that some compilers do in code generation to avoid evaluting terms which cannot affect the result even things like A + B + C vs B + A + C could be distinct if there were side effects in A,B or C. I know they should not be, but people do these things. Regards, -- Martin Brown __ CIS: 71651,470 Scientific Software Consultancy /^,,)__/