> import Prelude hiding (div)
> import qualified Prelude

------------------------------------------------------------
 Language E
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> add :: Int -> Int -> Int
> add x y = x + y

> sub :: Int -> Int -> Int
> sub x y = x - y

> div :: Int -> Int -> Int
> div x y = x `Prelude.div` y

> mul :: Int -> Int -> Int
> mul x y = x * y

------------------------------------------------------------
 Examples
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x = 3

> x = add 1 2

y = 17

> y = add (mul 3 4) 5

z = Haskell exception is raised: *** Exception: divide by zero

> z = div 1 0