Re: [Haskell-beginners] define action getInt like getLine

Hi, how can I write an action getInt :: IO Int that works like getLine :: IO String

The most literal way to write getInt would be: getInt :: IO Int getInt = do s <- getLine return (read s) which is just a more verbose version of: getInt' = read `fmap` getLine The above versions don't do any error checking, so you might prefer a getInt :: IO Maybe Int which returns Nothing in case the input is not an integer. You should read up on Monadic IO in Haskell. The Real World Haskell book is probably a good starting point. Rahul