Ola Fosheim Grøstad
ola.fosheim.grostad at gmail.com
Thu Jan 2 19:59:09 UTC 2020
On Thursday, 2 January 2020 at 19:25:08 UTC, Ola Fosheim Grøstad
> (123*3+50)/100... Or 3.14% of 123 as (123*314+5000)/1000.
So easy to make mistakes with fixed point, should've been
> Except division is slow so you would instead convert the
> divisor into a reciprocal and do a multiply instead (modern
> compilers do this for you if the divisor is known at compile
Well, in this specific case you could probably do
result = (value*percentage_reciprocal+5)/10;
but that is just one simple formula... it gets tricky real fast
when trying to do something more advanced in fixed point
efficiently and correctly.
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