Provide a getArgs function that returns a tuple (including the 0-tuple () or 1-tuple) if the supplied arguments match the demands of the program, in number and in type. The returned tuple must contain elements that are in the Typeable and Read classes.

Here's how to do a line count, getArgs takes a single argument, returning it as a String:

 main = getArgs >>= readFile >>= print . length . lines

Two different parameters, a Char and a String:

 main = do
    (ch,name) <- getArgs
    putStrLn (ch:"Name is: "++name)