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Re: Rosetta PGA-TRAM

by citromatik (Curate)
on Jun 13, 2009 at 13:19 UTC ( #771231=note: print w/ replies, xml ) Need Help??

in reply to Rosetta PGA-TRAM

In OCaml

let explode str = let rec aux pos acc = if pos < 0 then acc else aux (pred pos) (str.[pos] :: acc) in aux ((String.length str)-1) [] let d2a = function | 'M' -> 1000 | 'D' -> 500 | 'C' -> 100 | 'L' -> 50 | 'X' -> 10 | 'V' -> 5 | 'I' -> 1 | _ -> failwith "Incorrect character" let r2d str = List.fold_left (fun acc x -> let x' = d2a x in acc + x' - acc mod +x' * 2) 0 (explode (String.uppercase str));;
  • explode just converts a string into a list of its characters. The future standard library for OCaml, named Batteries included will include such a function by default.
  • The functional nature of OCaml allows a natural implementation of the algorithm


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