At 13:27 03-04-02 +0100, D. Tweed wrote:
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.
It's correct Haskell. Have a look at http://www.haskell.org/onlinereport/exps.html#sect3.14 Rijk-Jan