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

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	2017-01-27 11:02 +0000
Organization	A noiseless patient Spider
Message-ID	<87k29gzrxo.fsf@bsb.me.uk> (permalink)
References	(1 earlier) <87inp11s6w.fsf@bsb.me.uk> <36a74771-51d8-439a-bd1a-0c7338031b9c@googlegroups.com> <10dc87b2-3078-4b1d-a914-0461db1c80a6@googlegroups.com> <87sho5zaj9.fsf@bsb.me.uk> <74b7c25f-9f8f-4bc5-8380-9cb6e6e8bd1e@googlegroups.com>

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jonas.thornvall@gmail.com writes:

> Den fredag 27 januari 2017 kl. 00:06:24 UTC+1 skrev Ben Bacarisse:
>> 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.
>
> I feel you dodged the obstacle,

Probably.

> i asked if the boolean is
> generated/searched and found within loop and all values of the truth
> table can be found, how do you set the start condition, can i set the
> boolean to "null" at start?

If you asked this I missed it, but I couldn't answer it anyway because I
don't know what it means.

-- 
Ben.

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

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