From haskell-cafe  Wed Jan 26 21:09:17 2005
From: Jorge Adriano Aires <jadrian () mat ! uc ! pt>
Date: Wed, 26 Jan 2005 21:09:17 +0000
To: haskell-cafe
Subject: Re: [Haskell-cafe] Converting from Int to Double
Message-Id: <200501262109.17193.jadrian () mat ! uc ! pt>
X-MARC-Message: https://marc.info/?l=haskell-cafe&m=120491995439790


> >> How can I convert an Int into a Double?
> >
> > You don't convert to, you convert from :-)
> > The function 'fromIntegral' is probably what you want.
>
> And what function can I use to convert from Double to Int (the inverse of
> fromIntegral) ?

Use the functions in the RealFrac class.
http://www.haskell.org/onlinereport/standard-prelude.html#$tRealFrac

class  (Real a, Fractional a) => RealFrac a  where
     properFraction   :: (Integral b) => a -> (b,a)
     truncate, round  :: (Integral b) => a -> b
     ceiling, floor   :: (Integral b) => a -> b

J.A.