Am 29.06.2011 17:03, schrieb Bert Freudenberg: 
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?

- Bert -

_______________________________________________
Beginners mailing list
Beginners@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 -

_______________________________________________
Beginners mailing list
Beginners@lists.squeakfoundation.org
http://lists.squeakfoundation.org/mailman/listinfo/beginners
Well, I found in the selector browser no FloatD/E/Q, but I found corresponding methods asFloatD/E/Q.
Just for completeness of Information about that classes in question, I found a description of the methods:

onionmixer.net/extra_data/gst.pdf

6.104.4 Number: converting
asFloat This method’s functionality should be implemented by subclasses of Number
asFloatD This is mandated by the ANSI standard; since GNU Smalltalk currently does
        not support different floating-point classes, simply convert the receiver to a
           Float.
asFloatE This is mandated by the ANSI standard; since GNU Smalltalk currently does
        not support different floating-point classes, simply convert the receiver to a
           Float.
asFloatQ This is mandated by the ANSI standard; since GNU Smalltalk currently does
        not support different floating-point classes, simply convert the receiver to a
           Float.
...

I bolded parts of the text.

As I found out in the squeak sources, taht it uses this methods asFloatD/E/Q for the same reason!

Regards

B. Blochl