[Haskell-beginners] doubt....plz help me out

[jean verdier]

You forgot to process the tail part of the scanned string. Do something
with the tl binding in the scan function. Note that the scan function
returns Token and not [Token].


On Mon, 2011-10-17 at 20:17 -0600, kolli kolli wrote:
> I am new to haskell plz dnt mind
> 
> 
> scan :: [Char] -> Token
> scan ('i':'f':tl)  = IfKeyword 
> scan ('t':'h':'e':'n':tl)  = ThenKeyword
> scanp :: [Char] -> [Token]
> scanp t  = sequence (map scan t) 
> 
> when I call scan on my file which has "if then"
> then its just printing if as IfKeyword ..its nt talking the then word
> 
> I tried using sequence but its nt working..Can you please help me
> out..
> 
> I have to get the output as a list of tokens
> 
> [IfKeyword, ThenKeyword] 
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