Ola Fosheim Grøstad
ola.fosheim.grostad at gmail.com
Fri Jan 3 17:14:06 UTC 2020
And please forget the idea that fixed point is exact, it most
certainly is not! :-)
Let me give an example:
Assume that you have 21% VAT and prices are given including tax,
then in order to find the price without VAT you have to calculate
price/1.21, but in fixed point that becomes price*100/121 which
will have a remainder. So then you also have to deal with the
remainder, so not exact at all.
If you want the price without VAT, rounded you'll have to do:
(price * 200 / 242 + 1) / 2
If you want to deal with the price without VAT with no rounding,
you will have to emulate rational numbers...
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