haskell calculator

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case span (/=operator) unparsed of
    -- If the element is not found we call the function recursivly searching for the next
    -- operator in the register.
    (_, []) -> eval rest unparsed
    
    -- This is called if we do find a operator, we call the function from the register
    -- and recursivly calculate the rest of the unparsed content before we send it to
    -- the function.
    (beforeOperator, AfterOperator) ->
        function 
            (eval operatorRegister beforeOperator)
            (eval operatorRegister $ drop 1 afterOperator)

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Contributed on Aug 29 2022

Travinth Dayalaeaswaran

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haskell calculator

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main = putStrLn "Hello world"

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Travinth Dayalaeaswaran

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haskell calculator

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main = print (1 + 1)

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Travinth Dayalaeaswaran

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haskell calculator

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main = print (1 + 1)

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haskell calculator

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main = print (words "1 + 5 * 2")

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haskell calculator

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a list of strings = [String]

a integer = Int

a function that takes a integer and returns a string = Int -> String

a tuple of one integer and one string = (Int, String)

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haskell calculator

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type Operator = Double -> Double -> Double
type Entry = (String, Operator)
type Register = [Entry]

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haskell calculator

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operatorRegister :: Register -- The :: operator means 'is of type'
operatorRegister = [
                ("+", (+)),
                ("*", (*))
            ]

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haskell calculator

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calculate :: String -> Double
calculate = undefined

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haskell calculator

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calculate :: String -> Double
-- operatorRegister is the register we defined before.
calculate = eval operatorRegister . words

eval :: Register -> [String] -> Double
eval = undefined

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Travinth Dayalaeaswaran

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haskell calculator

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eval :: Register -> [String] -> Double
eval _ [number] = read number
eval ((operator, function):rest) unparsed =
    case span (/=operator) unparsed of
        (_, []) -> eval rest unparsed
        (beforeOperator, afterOperator) -> 
            function
                (eval operatorRegister beforeOperator)
                (eval operatorRegister $ drop 1 afterOperator)

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Source: Grepper

Tags: haskell calculator

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Contributed on Aug 29 2022

Travinth Dayalaeaswaran

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haskell calculator

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