mirror of
https://github.com/idris-lang/Idris2.git
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26 lines
521 B
Idris
26 lines
521 B
Idris
natToInt : Nat -> Integer
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natToInt Z = 0
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natToInt (S k) = 1 + natToInt k
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%builtin NaturalToInteger natToInt
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intToNat : Integer -> Nat
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intToNat i = if i <= 0
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then Z
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else S $ intToNat (i - 1)
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%builtin IntegerToNatural intToNat
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add : Nat -> Nat -> Nat
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add Z y = y
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add (S x) y = S (add x y)
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%transform "add" add x y = intToNat (prim__add_Integer (natToInt x) (natToInt y))
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main : IO ()
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main = do
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printLn $ intToNat 3141592
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printLn $ intToNat 12345
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printLn $ add 100 1000
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printLn $ add 9566 7554
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