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Haskell
Last Updated: May 24 2015 19:32, Started by
himura619
, May 24 2015 19:02
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#1
Posted 24 May 2015 - 19:02
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Am si eu nevoie de ajutor.Trebuie sa fac un calculator grafic (functiile sa fie date de utilizator ) in haskell. Ma poate ajuta cineva cu un cod sau o ideea , orice e bun?
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#2
Posted 24 May 2015 - 19:16
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https://www.youtube....KVKLuSnU4UIinKx
Si asta , ca nu am timp acum pt mai mult import Data.Char (isDigit) data Term = TermInt Integer | TermOp (Integer -> Integer -> Integer) evaluate :: String -> [Integer] evaluate = evalTerms . map mkTerm . words mkTerm :: String -> Term mkTerm termStr = case termStr of "+" -> TermOp (+) "-" -> TermOp (-) "*" -> TermOp (*) _ | and $ map isDigit termStr -> TermInt $ read termStr | otherwise -> error $ "invalid input `" ++ termStr ++ "'" evalTerms :: [Term] -> [Integer] evalTerms = foldl modifyStack [] where modifyStack stack term = case term of TermInt n -> n : stack TermOp op -> case stack of (a:b:_) -> op a b : drop 2 stack _ -> error "stack too small for operator application" L.E: cu grafica te descurci 
Edited by stefanutz13, 24 May 2015 - 19:18. |
#3
Posted 24 May 2015 - 19:32
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Nu stiu prea multe dar am sa incerc multumesc pentru ajutor
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