On 26 nov 2008, at 17:18, abdullah abdul Khadir wrote:
Hi,
The function getMyLine written by me is intended for getting a
complete string from the standard input.
import IO
getMyLine :: IO [Char]
getMyLine = do
c <- getChar
if(c == '\n')
then return ""
else cs <- getMyLine
return [c]
However I keep getting the following error:
io.hs:14:2: Parse error in pattern
Failed, modules loaded: none.
I fail to understand what the error is. I tried out various
things such as changing the alignment and so on to no avail. The
following program, however, compiled successfully though it has the
same structure as the previous program.
The "else" should be replaced by "else do". Probably you'll also want
the last line to be "return (c:cs)".
By the way, questions like these might be more appropriate on haskell-
beginners or haskell-cafe.
-chris
checkd :: IO Bool
checkd = do
c <- getChar
if(c=='d')
then return True
else return False
Prelude> :load ./io.hs
[1 of 1] Compiling Main ( io.hs, interpreted )
Ok, modules loaded: Main.
*Main> checkd
d
True
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