On Mar 23, 8:07 pm, Meikel Brandmeyer <m...@kotka.de> wrote:
> Hi,
>
> a bit naive, but it seems to work…
>
> user=> (defn round
> [x & {p :precision}]
> (if p
> (let [scale (Math/pow 10 p)]
> (-> x (* scale) Math/round (/ scale)))
> (Math/round x)))
> #'user/round
> user=> (round 78.37898794)
> 78
> user=> (round 78.37898794 :precision 3)
> 78.379
>
> There are probably thousand reasons not to do that…
Most important one being that it won't be reliable. Floats are
fundamentally not compatible with decimal rounding. You'll have to
switch to some other representation like (big) decimals, fixed point
or strings to get it.
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