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

On Thu, 05 Feb 2015 13:25:16 +0100 Roelof Wobben wrote:

Another question : how can I display the array ?

putStrln works only for strings,

Yep, so you need to convert it to a string and putStrLn that. Kindly enough typing ":i []" into ghci tells you, that lists have an instance for "show". Anonther option would be to convert every single list element to a string and putStrLn that. "map" comes in handy here (or mapM_ if you directly want to use print instead of putStrLn . show). best, Max