Created
September 6, 2021 14:02
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Reverse Polish Notation Calculator
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| main = do | |
| content <- getLine | |
| print $ calculate content | |
| calculate :: String -> Float | |
| calculate = head . foldl f [] . words | |
| f :: [Float] -> String -> [Float] | |
| f (x:y:rest) "+" = (x + y):rest | |
| f (x:y:rest) "-" = (y - x):rest | |
| f (x:y:rest) "*" = (x * y):rest | |
| f (x:y:rest) "/" = (x / y):rest | |
| f acc el = read el:acc | |
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