[Haskell-cafe] IO help

[Adrian Neumann]

Have a look at the wikibook:

http://en.wikibooks.org/wiki/Haskell/Simple_input_and_output


Am 07.05.2009 um 11:46 schrieb applebiz89:

>
> I havent done much IO at all in haskell, only within the function  
> itself.
> However I want to get the input from the interface for the function  
> and
> havent done this before.
>
> In my main function, I want to ask the user what they would like to do
> 'become fan' for example, then with their choice initiate the  
> function and
> ask for the appropriate input for that function. This is the code  
> below:
>
> main :: IO()
> do putStr "Hi there! what is your name: "
> fanName = getLine
> do putStr "1 = Insert film, 2 = Become a Fan, 3 = The number of  
> fans of a
> film, 4 = Film released in a year: "
> input = getLine
> read input :: Int
> (if input == 1 then main x = insertFilm [] else if input == 2 then  
> main x =
> becomeFan [] else if input == 3 then main x = numberOfFans [])
>
> Say they choose film in a given year function function:
>
> filmsInGivenYear :: Int -> [Film] -> [String]
> filmsInGivenYear filmYear films = [ title | (Film title director  
> year fans)
> <- films, year == filmYear]
>
> I need to ask the user what filmYear they want to insert. But i  
> need to do
> this from the main function...I chose to do an if statement to  
> choose what
> function they want, but i dont know where to go from there?
>
> any help will be greatly appreciated.
>
> thanks
>
> apple
> -- 
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> tp23423403p23423403.html
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>
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