Decimal arithmatic, was Re: Python GUI app to impress the boss?

Terry Reedy tjreedy at udel.edu
Wed Oct 2 15:05:35 CEST 2002


>>> OK, so don't use whole pennies (or smallest currency) as your
>>> base, use 10,000ths of a penny, but still use integer arithmetic
>>> for your calculations.

>> Normal Integers aren't big enough.  2^31 / 10K == 215K.

>That's why you want double-floats.  2^53 / 10K = 900G

Or 64 bit integers.  AMD has just announced new series of 64 bit chips
initially aimed at server market but ultimately at desktops.  I
suspect that such will be common by 2010.

TJR






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