Re: [Haskell-beginners] Couldn't match expected type ‘IO ()’ with actual type [Integer]

"Roelof Wobben":

I have this :

-- | Main entry point to the application. module Main where

-- | convert a number to a array in pieces where a negative number will

be a empty array.

toDigits :: Integer -> [Integer] toDigits n | n < 0 = [] | otherwise = n/10 : []

-- | The main entry point. main :: IO () main = do toDigits 123

First of all, what do you expect from your program? The problem with your code is that `main` declares type `IO ()` in its signatures but its body has another type, [Integer]. What do you think is wrong with the compiler's output? -- Nadir