[Haskell-cafe] help with Haskell programming

Hello I am kinda newbie in Haskell you can help help me with some programming I am trying to make function like for example func :: (a -> Bool) -> (a -> Bool) this function make calculation and return bool . I want to be able to make bool True when It is False and False when it is True while returning the a. Thank you -- Mujtaba Ali Alboori