[Haskell] Help-me read file

[kahl at cas.mcmaster.ca]

 > I have a file with 100 lists, with 100 ints.
 > 
 > I have to read the file and apply the map and sort functions on lists.
 > 
 > II did it to read file:
 > 
 > learquivo :: FilePath -> IO ([[Int]])
 > learquivo s = do
 >            conteudo <- readFile s
 >            return (read conteudo)
 > 
 > But now applying the sort, the error appears:
 > 
 > 
 > <interactive>:1:5:
 >    Couldn't match expected type `[a]'
 >           against inferred type `IO [[Int]]'
 > 
 > how can I fix?

You did not even say how you produced that error.


Assuming you are in GHCi, you want to do:


m <- learquivo "miarquivo"

:t m


(Think of the interactive GHCi prompt as inside a big ``do''.)



Hope this helps!

Wolfram