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19 lines
333 B
Idris
19 lines
333 B
Idris
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data Bool = False | True
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data Nat = Z | S Nat
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not : Bool -> Bool
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not False = True
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not True = False
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isZero : Nat -> Bool
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isZero Z = True
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isZero (S k) = False
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isOdd : Nat -> Bool
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isOdd Z = False
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isOdd (S k) = not (isOdd k)
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testZ : Nat -> String
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testZ x = if isZero x then "Zero" else
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if isOdd x then "Odd" else "Even"
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