For example, `main = do input <- getLine ...', where `getLine' is an action as distinguished from a function such as `main'.  Other examples of actions in Haskell include `print', `putStrLn' and any process that reads from or writes to a file. Of course, the list of actions doesn't end there, though the examples here should answer your question.
Sincerely,
Matt

At 21:44 19/10/2013, you wrote:

What do you mean by "action"?

Antoine


On Fri, Oct 18, 2013 at 9:26 PM, MJ Williams < matthewjwilliams101@gmail.com> wrote:

Hello

What are the formal properties of an action?

How does an action differ from a function?

Sincerely,

Matthew

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