Re: [Haskell-beginners] turning a value into an expression

2009/11/9 John Moore :

Hi,    How do I turn a value into an expression I want to do for e.g. 8 - 1 turn it into (subtract (Val8) (Val1)

Any ideas

J _______________________________________________ Beginners mailing list Beginners@haskell.org http://www.haskell.org/mailman/listinfo/beginners

import Prelude hiding ((-)) data Val a = Val a deriving Show data Expr a b = Subtract a b deriving Show (-) :: Num a => a -> a -> Expr (Val a) (Val a) x - y = Subtract (Val x) (Val y)

4 - 3 Subtract (Val 4) (Val 3)

-- Deniz Dogan