[BUG] Arithmetic troubles about float numbers

Guillaume Grondin grondin at ensm-douai.fr
Thu Jun 22 17:52:09 UTC 2006


Indeed, my image was just broken.
Thx

Guillaume

Tom Phoenix wrote:
> On 6/22/06, Guillaume GRONDIN <grondin at ensm-douai.fr> wrote:
>
>> 1) Any number containing 10 digits and over cannot be converted in a 
>> float.
>> Ex : 1234567890 asFloat  "210.0" (similar problem for 0.1234567890)
>
> Works for me, with a 3.8 on a Mac OS X VM. I don't know why you're
> having troubles. What does your TestRunner do on a FloatTest?
>
>> Consequence: arithmetic calculations using #asFloat may be erroneous
>
> Calculations using floating point approximations may be erroneous for
> many, many reasons. But this shouldn't be one of them.
>
>> (637629679868427784505109440202397271654068317554218172555028 /
>> 16543612251060553497428173841399257071316242218017578125) asFloat.
>> "67720.5333333333" "ERRONEOUS!"
>
> Again, I'm getting what seems to be the correct answer; not at all
> what you're seeing.
>
>> PS : I use win32 VM (3.7.1) and 3.9b-7033 image.
>
> Try with a "fresh" 3.8 or 3.9 image and see whether you get the same
> things. Good luck with it!
>
> --Tom Phoenix
>
>

-- 
Guillaume Grondin
===========================================
Elève-Chercheur en Informatique
Département GIP, Ecole des Mines de Douai
941, rue Charles Bourseul
BP 10838 - 59508 Douai Cedex
Tél : (+33) (0) 3 27 71 24 53
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Email: grondin at ensm-douai.fr






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