On Wed, 3 Apr 2002, Michal Wallace wrote:
module Main where alphabet = "abcdefghijklmnopqrstuvwxyz" count ch str = length [c | c <- str , c == ch] hist str = [count letter str | letter <- alphabet] oneline ch str = [ch] ++ " " ++ stars (count ch str) stars x = if x == 0 then "" else "*" ++ stars ( x - 1 ) report str ch = do putStrLn ( oneline ch str ) loop f (h:t) = if t == [] then f h else do f h loop f t main = do content <- getContents let rpt letter = report content letter loop rpt alphabet """
Other than ignoring upper case letters, and being really really slow, it seems to work fine in hugs....
I'm a bit confused how this can have worked... in Haskell `let' is used in the context of a `let ..<1>.. in ..<2>..' where the code ellided in <1> binds some names to values which are then used in the expression <2> (as in `let x=sqrt 2 in exp x') and so the contents of main isn't (unless I'm missing something) syntactically Haskell. Overall the code looks like a reasonable transliteration into Haskell; as you get more competent with Haskell you'll find various higher level functions that replace some of your stuff, e.g., stars can be written as stars x = take x (repeat '*'). Regarding Assoc, try just `import Assoc' without trying to cut down on which entities are imported; if it works then you've missed some needed elements from your import specification (the bit in ()'s after the module name); if it doesn't then it probably can't find Assoc at all. HTH ___cheers,_dave_________________________________________________________ www.cs.bris.ac.uk/~tweed/|`...heat generated by its microprocessors will email:tweed@cs.bris.ac.uk|slope upward exponentially, reaching the power work tel:(0117) 954-5250 |density of a nuclear reactor before 2010'-Intel