Detect arithmetic underflow with unsigned integers
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| Language | Haskell |
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| Owner | rightfold |
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| Modified | |
| Visibility | Public |
module Main
( main
) where
sub :: Word -> Word -> Maybe Word
sub a b | a >= b = Just (a - b)
| otherwise = Nothing
main :: IO ()
main = do
print $ sub 2 1
print $ sub 1 2
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