HaskellCourse/peano.hs

data Nat = Zero | Succ Nat deriving Show

intValOf thisNat = case thisNat of
	Zero -> 0
	Succ nextNat -> 1 + intValOf nextNat

natValOf thisInt = if thisInt == 0 then Zero else Succ (natValOf (thisInt - 1))

addition aNat tinyNat = case tinyNat of
	Zero -> aNat
	Succ tinierNat -> Succ (addition aNat tinierNat)

additiont aNat tinyNat = case tinyNat of
	Zero -> aNat
	Succ tinierNat -> additiont (Succ aNat) tinierNat