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Module: Prelude
Class: Num
Instances: Double, Float, Int, Integer 


class  (Eq a, Show a) => Num a  where
    (+), (-), (*)    :: a -> a -> a
    negate           :: a -> a
    abs, signum      :: a -> a
    fromInteger      :: Integer -> a

        -- Minimal complete definition:
        --      All, except negate or (-)
    x - y            =  x + negate y
    negate x         =  0 - x


instance Num Int where
 
 ...


instance Num Integer where
  
...


instance Num Float where
  
...


instance Num Double where
  
...