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On Sat, Jan 16, 2010 at 10:11:31AM +0000, Owain Clarke wrote:
> On Thu, Jan 14, 2010 at 11:51:35AM +0000, Owain Clarke wrote:
> >> Could anyone explain to me why 3*7.6 gives me 22.799999999999997? I have
> >> Python 2.5.2
> >>
> OK, now I understand. Thanks all - will continue to seek a workaround,
> and I'm guessing that, as the amounts are to do with pounds and pence, I
> should convert everything pence before multiplying so that the
> calculation is with integers.
I believe that this is the usual method applied with financial
values. You should also be aware of the limits of integer computation
-- with 32-bit numbers, you can only get to about 42 million pounds
before running out of integers. You can get arbitrary-sized integers
in Python by casting everything to long().
Another alternative would be to use the decimal module[1] for all
your numbers.
Hugo.
[1]
http://docs.python.org/library/decimal.html
--
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
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