Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/prelude/Prelude/RealFrac_Double.hs

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module Prelude(RealFrac(..)) where

instance  RealFrac Double where
    properFraction x =  case decodeFloat x of
			  (m,n) ->
			    if n >= 0 then
				(fromInteger m * fromInteger (floatRadix x) ^ n, 0)
			    else
				case quotRem m ((floatRadix x)^(negate n)) of
			          (w,r) -> (fromInteger w, encodeFloat r n)

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