Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.javascript > #32362

Re: Logic problem, i always had problem translate until statements into while

Path csiph.com!eternal-september.org!feeder.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups comp.lang.javascript
Subject Re: Logic problem, i always had problem translate until statements into while
Date Thu, 26 Jan 2017 23:06:18 +0000
Organization A noiseless patient Spider
Lines 51
Message-ID <87sho5zaj9.fsf@bsb.me.uk> (permalink)
References <7112e5ec-cc6f-4b7b-b7db-b83b52bf8fbe@googlegroups.com> <87inp11s6w.fsf@bsb.me.uk> <36a74771-51d8-439a-bd1a-0c7338031b9c@googlegroups.com> <10dc87b2-3078-4b1d-a914-0461db1c80a6@googlegroups.com>
Mime-Version 1.0
Content-Type text/plain
Injection-Info mx02.eternal-september.org; posting-host="3b591314b8affd39d0054b2ccd164f7b"; logging-data="32385"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18o6Cb4lBiNMaHbHWNJLSz2DMhQgiqwBqA="
Cancel-Lock sha1:2m57VoAL6Kz7XKiS6tO3bLHzSrw= sha1:gmQM5YFJ+zZl8AH7pWLWHTeK0m4=
X-BSB-Auth 1.a97a4f6db2e4442f011f.20170126230618GMT.87sho5zaj9.fsf@bsb.me.uk
Xref csiph.com comp.lang.javascript:32362

Show key headers only | View raw

jonas.thornvall@gmail.com writes:

> Den torsdag 26 januari 2017 kl. 22:24:32 UTC+1 skrev jonas.t...@gmail.com:
>> Den torsdag 26 januari 2017 kl. 21:29:05 UTC+1 skrev Ben Bacarisse:
>> > jonas.thornvall@gmail.com writes:
>> > 
>> > > do until (regular == true && connected == false )
>> > >
>> > > I honestly feel a bit lost, because i think they are so easy to code
>> > > using do until.
>> > 
>> > What as the initial values of 'regular' and 'connected'?
>> > 
>> > > So how should i think about it?
>> > 
>> > Provided the initial value of the resulting while condition is true you
>> > just need to invert it:
>> > 
>> >   while (!(regular == true && connected == false)) ...
>> > 
>> > You can use De Morgan's laws to simplify that if you like:
>> > 
>> >   !(A && B) <=> !A || !B
>> >   !(A || B) <=> !A && !B
>> > 
>> > in your case
>> > 
>> >      !(regular == true && connected == false)
>> >   => !(regular == true) || !(connected == false) 
>> >   => regular != true || connected != false
>> > 
>> > which I'd just write as
>> > 
>> >   while (!regular || connected) ...
>> > 
>> > Often, the use of do ... until is simply an error (while is needed more
>> > often in algorithms than do...until).  In those cases there is no need
>> > for the loop to execute at least once and you don't need to check that
>> > '!regular || connected' is initially true.
>> > 
>> > -- 
>> > Ben.
>> 
>> Unfortunately they are both false,

Why is that unfortunate?  If they are both initially false your
do...until can be written as a while with the condition negated.

<snip>
-- 
Ben.

Back to comp.lang.javascript | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-26 10:39 -0800
  Re: Logic problem, i always had problem translate until statements into while Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-26 20:28 +0000
    Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-26 13:24 -0800
      Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-26 13:33 -0800
        Re: Logic problem, i always had problem translate until statements into while Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-26 23:06 +0000
          Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 01:33 -0800
            Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 01:57 -0800
              Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 02:17 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 02:35 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 02:39 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 02:43 -0800
                Re: Logic problem, i always had problem translate until statements into while Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-27 11:23 +0000
                Re: Logic problem, i always had problem translate until statements into while Tim Streater <timstreater@greenbee.net> - 2017-01-27 12:14 +0000
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 08:00 -0800
                Re: Logic problem, i always had problem translate until statements into while Gene Wirchenko <genew@telus.net> - 2017-01-27 09:29 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 10:43 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 10:44 -0800
                Re: Logic problem, i always had problem translate until statements into while Gene Wirchenko <genew@telus.net> - 2017-01-27 15:46 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 18:20 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 18:34 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 18:51 -0800
                Re: Logic problem, i always had problem translate until statements into while John Harris <niam@jghnorth.org.uk.invalid> - 2017-01-28 10:07 +0000
                Re: Logic problem, i always had problem translate until statements into while Gene Wirchenko <genew@telus.net> - 2017-01-30 09:14 -0800
                Re: Logic problem, i always had problem translate until statements into while "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-01-28 10:48 +0100
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-28 05:05 -0800
                Re: Logic problem, i always had problem translate until statements into while "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-01-27 13:43 +0100
                Re: Logic problem, i always had problem translate until statements into while Scott Sauyet <scott.sauyet@gmail.com> - 2017-01-27 19:52 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 22:25 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 22:36 -0800
                Re: Logic problem, i always had problem translate until statements into while Scott Sauyet <scott.sauyet@gmail.com> - 2017-01-29 18:05 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-30 09:25 -0800
                Re: Logic problem, i always had problem translate until statements into while Dr J R Stockton <reply1700@merlyn.demon.co.uk.invalid> - 2017-01-31 23:12 +0000
                Re: Logic problem, i always had problem translate until statements into while "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-02-01 09:22 +0100
            Re: Logic problem, i always had problem translate until statements into while Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-27 11:02 +0000
              Re: Logic problem, i always had problem translate until statements into while Tim Streater <timstreater@greenbee.net> - 2017-01-27 12:11 +0000
              Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 07:53 -0800
                Re: Logic problem, i always had problem translate until statements into while "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-01-27 17:07 +0100
                Re: Logic problem, i always had problem translate until statements into while Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-28 00:55 +0000
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 18:14 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 18:15 -0800
                Re: Logic problem, i always had problem translate until statements into while Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-28 15:22 +0000
                Re: Logic problem, i always had problem translate until statements into while Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-01-28 16:54 +0100
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-28 13:53 -0800
                Re: Logic problem, i always had problem translate until statements into while Tim Streater <timstreater@greenbee.net> - 2017-01-28 22:13 +0000
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-29 01:27 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-29 09:41 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-02-01 08:51 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-02-01 09:03 -0800
                Re: Logic problem, i always had problem translate until statements into while "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-02-01 19:19 +0100
                Re: Logic problem, i always had problem translate until statements into while Tim Streater <timstreater@greenbee.net> - 2017-02-01 18:35 +0000
                Re: Logic problem, i always had problem translate until statements into while "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-02-01 19:40 +0100
                Re: Logic problem, i always had problem translate until statements into while Tim Streater <timstreater@greenbee.net> - 2017-02-01 19:06 +0000
                Re: Logic problem, i always had problem translate until statements into while Tim Streater <timstreater@greenbee.net> - 2017-02-01 19:09 +0000
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-02-01 08:51 -0800
                Re: Logic problem, i always had problem translate until statements into while Tim Streater <timstreater@greenbee.net> - 2017-02-01 16:56 +0000
            Re: Logic problem, i always had problem translate until statements into while "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-01-27 13:36 +0100

csiph-web