natural numbers

Hello,

thanks a lot for the expeditious replies to my trifling question. Here is another one:

Can you tell me why the following does not function? I mean the last part for converting number into the new data type. If this is not a quick fix, please ignore it. As an utter beginner, I cannot estimate the significance of my questions.




data Nat = Zero | Succ Nat

natToInt Zero = 0
natToInt (Succ n) = (natToInt n) + 1

number n = case n of
	0 -> Zero
	_ -> Succ(number(n-1))





Thank you very much.
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