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chomado/product.hs

Last active August 29, 2015 14:12
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product.hs
-- fact 5
-- → 5 * 4 * 3 * 2 * 1
fact :: Int -> Int
fact 0 = 1
fact x = x * fact (x - 1)
main :: IO()
main = do
print $ fact 5 -- 120
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