Groups > comp.lang.forth > #19991

Re: Double integer input

From	rickman <gnuarm@gmail.com>
Newsgroups	comp.lang.forth
Subject	Re: Double integer input
Date	2013-02-24 14:54 -0500
Organization	A noiseless patient Spider
Message-ID	<kge0ns$103$9@dont-email.me> (permalink)
References	(2 earlier) <brWdnQmhLoxDJ7vMnZ2dnUVZ_uKdnZ2d@supernews.com> <kg6fbr$9m5$1@online.de> <2013Feb22.163514@mips.complang.tuwien.ac.at> <H-qdnbjG_ZCNX7rMnZ2dnUVZ_sidnZ2d@supernews.com> <2013Feb23.171502@mips.complang.tuwien.ac.at>

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On 2/23/2013 11:15 AM, Anton Ertl wrote:
> "Elizabeth D. Rather"<erather@forth.com>  writes:
>>> And there was a specific occasion that lead to taking out "," in
>>> Gforth: I wrote a priece of code that used "2,", and it compiled fine
>>> but did not work.  Eventually I found that Gforth at the time had no
>>> word "2,", but it had "," as double indicator.  So it saw a double
>>> literal instead of the word "2,".  With Elisabeth's list, "2-" would
>>> be another trap.
>>
>> If know that punctuation makes doubles, you don't make names that look
>> like punctuated numbers, just as you don't make names that look like
>> "-2". It really isn't that hard!
>
> Well, the problem was that Gforth did not have a name "2,", but I
> expected it to, and it accepted "2," (but as a number).
>
> Now "," is a regular Forth word, and words for dealing with two cells
> (or doubles) are commonly formed by prepending 2 (Forth-94 has 2! 2>R
> 2@ 2CONSTANT 2DROP 2DUP 2LITERAL 2OVER 2R>  2R@ 2ROT 2SWAP 2VARIABLE),
> so "2," is a likely word name.
>
> If punctuation in word names was a mistake, the mistake was to have a
> word called ",".
>
> However, I believe that having "," in numbers was a mistake.

Just so I can understand what you are saying.  You didn't know what 
characters were interpreted to be numbers or the formatting for the 
Forth you were using, you didn't know if 2, was a word in the version of 
Forth you were using and when you wrote code based on your assumptions 
you didn't like the fact that it didn't provide an error message?

Why does this problem require the modification of a Forth environment? 
Can't you just read the docs on the Forth system you want to use?  Am I 
trivializing the problem?  I'm not getting this.

Personally I think having '.' in doubles was a mistake and they should 
use ',' instead.  Save '.' for floats, more inline with common use.

-- 

Rick

Thread

Double integer input Rosangela Medeiros da Silva <rosangelamesil@gmail.com> - 2013-02-13 18:15 -0800
  Re: Double integer input Rosangela Medeiros da Silva <rosangelamesil@gmail.com> - 2013-02-14 02:07 -0800
    Re: Double integer input Coos Haak <chforth@hccnet.nl> - 2013-02-14 16:18 +0100
      Re: Double integer input Coos Haak <chforth@hccnet.nl> - 2013-02-14 16:27 +0100
      Re: Double integer input "A. K." <akk@nospam.org> - 2013-02-14 20:54 +0100
        Re: Double integer input Coos Haak <chforth@hccnet.nl> - 2013-02-14 23:20 +0100
  Re: Double integer input "Ed" <invalid@nospam.com> - 2013-02-22 11:00 +1100
    Re: Double integer input "Elizabeth D. Rather" <erather@forth.com> - 2013-02-21 14:24 -1000
      Re: Double integer input Bernd Paysan <bernd.paysan@gmx.de> - 2013-02-22 01:50 +0100
        Re: Double integer input anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-02-22 15:35 +0000
          Re: Double integer input Bernd Paysan <bernd.paysan@gmx.de> - 2013-02-22 18:15 +0100
            Re: Double integer input stephenXXX@mpeforth.com (Stephen Pelc) - 2013-02-22 19:02 +0000
            Re: Double integer input anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-02-23 17:27 +0000
              Re: Double integer input Bernd Paysan <bernd.paysan@gmx.de> - 2013-02-24 03:42 +0100
          Re: Double integer input "Elizabeth D. Rather" <erather@forth.com> - 2013-02-22 09:08 -1000
            Re: Double integer input anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-02-23 16:15 +0000
              Re: Double integer input stephenXXX@mpeforth.com (Stephen Pelc) - 2013-02-23 17:35 +0000
                Re: Double integer input anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-02-25 15:25 +0000
              Re: Double integer input albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-02-23 19:34 +0000
                Re: Double integer input "Rod Pemberton" <do_not_have@notemailnotz.cnm> - 2013-02-23 18:35 -0500
              Re: Double integer input Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-02-23 14:58 -0600
                Re: Double integer input Zbiggy <zbigniew2011REMOVE@gmail.REMOVE.com> - 2013-02-23 22:01 +0100
                Re: Double integer input albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-02-24 04:03 +0000
                Re: Double integer input "Elizabeth D. Rather" <erather@forth.com> - 2013-02-23 18:13 -1000
                Re: Double integer input Zbiggy <zbigniew2011REMOVE@gmail.REMOVE.com> - 2013-02-24 12:01 +0100
                Re: Double integer input anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-02-25 18:09 +0000
                Re: Double integer input rickman <gnuarm@gmail.com> - 2013-02-24 15:01 -0500
                Re: Double integer input Coos Haak <chforth@hccnet.nl> - 2013-02-25 01:13 +0100
                Re: Double integer input Mark Wills <markrobertwills@yahoo.co.uk> - 2013-02-24 23:44 -0800
                Re: Double integer input rickman <gnuarm@gmail.com> - 2013-02-27 07:47 -0500
                Re: Double integer input Mark Wills <markrobertwills@yahoo.co.uk> - 2013-02-24 23:42 -0800
                Re: Double integer input Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-02-25 03:57 -0600
                Re: Double integer input albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-02-25 14:09 +0000
                Re: Double integer input Bernd Paysan <bernd.paysan@gmx.de> - 2013-02-25 16:45 +0100
                Re: Double integer input Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-02-25 18:26 -0600
                Re: Double integer input Bernd Paysan <bernd.paysan@gmx.de> - 2013-02-26 02:04 +0100
                Re: Double integer input Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-02-26 05:10 -0600
                Re: Double integer input Bernd Paysan <bernd.paysan@gmx.de> - 2013-02-26 15:31 +0100
                Re: Double integer input Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-02-26 10:28 -0600
                Re: Double integer input anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-02-25 16:38 +0000
              Re: Double integer input rickman <gnuarm@gmail.com> - 2013-02-24 14:54 -0500
                Re: Double integer input "Elizabeth D. Rather" <erather@forth.com> - 2013-02-24 11:59 -1000
                Re: Double integer input anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-02-25 18:11 +0000
                Re: Double integer input rickman <gnuarm@gmail.com> - 2013-02-27 07:58 -0500
                Re: Double integer input anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-03-02 17:10 +0000
      Re: Double integer input "Ed" <invalid@nospam.com> - 2013-02-22 13:22 +1100
        Re: Double integer input "Elizabeth D. Rather" <erather@forth.com> - 2013-02-21 16:31 -1000
      Re: Double integer input Alex McDonald <blog@rivadpm.com> - 2013-02-22 04:54 -0800
        Re: Double integer input "WJ" <w_a_x_man@yahoo.com> - 2013-02-24 22:05 +0000
          Re: Double integer input Paul Rubin <no.email@nospam.invalid> - 2013-02-24 15:02 -0800
          Re: Double integer input Brad Eckert <hwfwguy@gmail.com> - 2013-02-25 09:22 -0800
            Re: Double integer input Brad Eckert <hwfwguy@gmail.com> - 2013-02-25 10:21 -0800
          Re: Double integer input Alex McDonald <blog@rivadpm.com> - 2013-02-26 07:47 -0800
        Re: Double integer input "WJ" <w_a_x_man@yahoo.com> - 2013-02-28 06:27 +0000
      Re: Double integer input Paul Rubin <no.email@nospam.invalid> - 2013-02-23 21:34 -0800
        Re: Double integer input "Elizabeth D. Rather" <erather@forth.com> - 2013-02-24 08:16 -1000

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