[Haskell-cafe] Newbied question on IO Monad
lemming at henning-thielemann.de
Tue Sep 12 08:21:42 EDT 2006
On Tue, 12 Sep 2006, Sara Kenedy wrote:
> update :: String -> String
> update sss = ...
> main = do writeFile "myFile.txt" sss
> x <- callSystem "myFile.txt"
> y <- openFile "result.txt" ReadMode
> zzz <- hGetContents y
> return zzz
> I know that function main returns IO String, function update returns
> String. And my purpose is to get the string zzz from main for the
> value return of function update. But I do not know which way I can do.
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