Comment 25 for bug 882036
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| Cloves Almeida (cjalmeida) wrote Re: rounding error | #25 |
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f33e652
(Get the code!)
It seems that the rabbit hole goes deeper. Neither algorithm works. Accounting does not follow IEEE rounding rules - they resort to something called "banker's rounding" which is implemented in Python's decimal (and Java's BigDecimal) as ROUND_HALF_EVEN.
In Brazil (and I suppose in other countries too) our standard's body enforce such rounding mode everywhere.
I'm also for using Python decimal for rounding. Nevertheless, there's an algorithm (in C++) for implementing banker's rounding for float types in http://