[Haskell-beginners] Is this scope range problem?

[Luca Toscano]

On 12/14/2010 07:24 AM, Sok H. Chang wrote:
> Hello, everyone.
Hello,
I don't understand very well what you're trying to do in your code, but 
if it is simply reading from a file and put the output into another file 
there is a better way:

import System.IO
import System.Random

sentenceAry = []

main :: IO ()
main = do
     inh <- openFile "c:\\Documents and 
Settings\\shaegis\\inputFile.txt" ReadMode
     outh <- openFile "c:\\Documents and 
Settings\\shaegis\\outputFile.txt" WriteMode
     mainloop inh outh
     hClose inh
     hClose outh

mainloop :: Handle -> Handle -> IO ()
mainloop inh outh = do
     ineof <- hIsEOF inh
     if ineof
         then
             return ()
         else do
             inpStr <- hGetLine inh
             hPutStrLn outh inpStr
             mainloop inh outh


I hope I've understood the problem.. In your code 'inpStr' wasn't in 
scope, because you've declared it  only into else block..

Luca