[Python-Dev] Revised decimal type PEP

Aahz Maruch aahz@rahul.net
Tue, 31 Jul 2001 18:07:50 -0700 (PDT)

Greg Ewing wrote:
> aahz@rahul.net (Aahz Maruch):
>> Truncation (rounding), overflow, and underflow errors can
>> occur under addition, subtraction, and multiplication.  It's trivial to
>> set them to be unbounded, but then Cowlishaw provides no mechanism for
>> determining the truncation of division.
> If you allow for the representation of repeating parts in your
> unbounded decimals, they could be closed under division. (I think --
> does the division of one repeating decimal by another always lead to
> a third repeating decimal?  Yes, it must, because every rational can
> be expressed as a repeating decimal and vice versa, IIRC. Hmmm, that
> means we'd just be implementing rationals another way...)

<shudder>  Tell ya what, *you* write the algorithm and I'll think about
it sometime in the next five years.  ;-)
                      --- Aahz (@pobox.com)

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