変更 階乗 - Wikipedia Haskell fact :: Int -> Int fact 0 = 1 fact n = n * fact (n - 1) main :: IO () main = do print (fact 10) -- > 3628800 Python def fact(n): if n == 0: return 1 return n * fact(n - 1) print(fact(10)) #-> 3628800 Ruby def …