[Haskell-beginners] convert to fixed length Int

[Carlos J. G. Duarte]

On 08/17/12 01:42, Christopher Howard wrote:
> Hi. In Haskell, how would I go about converting from a Double (or Float)
> type to a Data.Int.Int8, Data.Int.Int16, and so forth? (Of course,
> expecting rounding and damage to out of range values.)
>
> I was playing around with signal generation using trig functions (hence
> the floating types) but the actual output has to be Int16.
>
>

Don't know if there's a better or correct way, but this seems to work:

ghci> let c = (round 256.6) :: Int16
ghci> :type c
c :: Int16

It rolls over at overflow:

ghci> let c = (round 65537) :: Int16
ghci> c
1