Aw: Re: [Newbies] Float-Subclasses?

[bblochl at arcor.de]

----- Original Nachricht ----
Von:     Bert Freudenberg <bert at freudenbergs.de>
An:      "A friendly place to get answers to even the most basic questions about
	Squeak." <beginners at lists.squeakfoundation.org>
Datum:   29.06.2011 17:03
Betreff: Re: [Newbies] Float-Subclasses?

> 
> On 29.06.2011, at 16:29, bb wrote:
> 
> > Am 29.06.2011 15:56, schrieb Bert Freudenberg:
> >> On 29.06.2011, at 15:34, bb wrote:
> >> 
> >>> I found that there are some Float-Subclasses: 
> >>> FloatD
> >>> FloatE
> >>> FloatQ
> >>> How can I use them and what are they good for? 
> >>> I do not understand the use of
> >>> LargeZeroInteger
> >>> as well.
> >> These classes are not in any official Squeak image. What image are you
> using? Which packages are they in?
Am 29.06.2011 17:03, schrieb Bert Freudenberg:
> Well, if you are not actually using Squeak then it would at least help to state which Smalltalk you are referring too. 


That was the mail where the Smalltalk brand came in,  the name of I do not want to repeat. Would have been better to bring in the "Draft American National Standard for Information Systems - Programming Languages - Smalltalk?

Thank you for all the many sympathic responds to my question, mostly correct. I can not and will not respond to every single argument.

There was a special reason for my question, namely this method -ther are many others helpful for numeric "precise" calclatons:

decimalDigits
    Return the number of decimal digits of precision for a FloatD. Technically, if P is the precision for the representation, then the decimal precision Q is the maximum number of decimal digits such that any floating point number with Q base 10 digits can be rounded to a floating point number with P base 2 digits and back again, without change to the Q decimal digits. 

Please understand that I forgot where I found the definition.

Anyway, thanks again. I do not longer want to waste your time and get off the mail list - now.

Cheers and have fun!

B. B.



> >> 
> >> - Bert -
> >> 
> >> _______________________________________________
> >> Beginners mailing list
> >> Beginners at lists.squeakfoundation.org
> >> http://lists.squeakfoundation.org/mailman/listinfo/beginners
> > I am badly curious - so I sometimes cross check with other Smalltalk80
> > versions. I hope that is not a betrayal.
> 
> Well, if you are not actually using Squeak then it would at least help to
> state which Smalltalk you are referring too. 
> 
> > I found that classes in a GNU Smalltalk-80  documentation
> > http://www.gnu.org/software/smalltalk//manual-base/html_node/FloatD.html.
> I
> > was not aware that this was a GNU Smalltalk docu.
> > 
> > But that classes do have some interesting methods.
> 
> FWIW, Squeak has only one Float class (IEEE double-precision, 64 bits). In
> addition, there is FloatArray, storing Floats as 32 bit single-precision
> values.
> 
> - Bert -
> 
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