odd_1.hs

contents

{-# htermination (oddMyInt :: MyInt  ->  MyBool) #-} 
import qualified Prelude 
data MyBool = MyTrue | MyFalse 
data List a = Cons a (List a) | Nil 
data MyInt = Pos Nat  | Neg Nat ;

data Nat = Succ Nat  | Zero ;

primEvenNat :: Nat  ->  MyBool;
primEvenNat Zero = MyTrue;
primEvenNat (Succ Zero) = MyFalse;
primEvenNat (Succ (Succ x)) = primEvenNat x;

primEvenInt :: MyInt  ->  MyBool;
primEvenInt (Pos x) = primEvenNat x;
primEvenInt (Neg x) = primEvenNat x;

evenMyInt :: MyInt  ->  MyBool
evenMyInt = primEvenInt;

not :: MyBool  ->  MyBool;
not MyTrue = MyFalse;
not MyFalse = MyTrue;

pt :: (a  ->  b)  ->  (c  ->  a)  ->  c  ->  b;
pt f g x = f (g x);

oddMyInt :: MyInt  ->  MyBool
oddMyInt = pt not evenMyInt;

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