[Haskell-cafe] Problem with percentage function?

[Karl Voelker]

On Sun, Apr 20, 2014, at 02:12 PM, Chapman, Anthony Sergio wrote:
> I would it to round to 2 decimal places no matter what the size of the
> input is
> 

> The problem is that what I actually get is 22.220000000000002
> 

The Double type cannot represent all values exactly, which produces this
behavior. [1]

If you just want to round the number for display purposes, you should
probably round it as part of the conversion to text.

Otherwise, there are a lot of other numeric representations, but the
right one would depend on your application.

-Karl


1: http://en.wikipedia.org/wiki/Double_precision_floating-point_format