[Python-Dev] Re: long number multiplication (original) (raw)
Nick Coghlan ncoghlan at iinet.net.au
Tue Dec 7 09:39:06 CET 2004
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Christopher A. Craig wrote:
i needed to implement this myself and was thinking of storing the digits of an integer in a list.
That's sort of what Python does except the "digits" are 15 bits, not base 10. Doing it in base 10 would be a huge pain because of the problems with base 10->base 2 conversion.
Indeed. Python's Decimal data type stores the digits in a list for ease of power of 10 multiplication & rounding (the precision rules means a lot of that goes on). However, it converts that list of digits to a long integer in order to do addition, multiplication or division.
Cheers, Nick.
-- Nick Coghlan | ncoghlan at email.com | Brisbane, Australia
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