CODEWITHSUNDEEP
swift
David Levanon
David Levanon

Reputation: 5

swift calculator operation in a switch case

i am new in programming swift.i have made this code by following other tutorials but i can´t find the correct write typ to perform operation?

@IBAction func operation(_ sender: UIButton) {
    let operate = sender.currentTitle!
    switch operate {
    case "+" : performOperation() {}
    case "-" : performOperation() {}
    case "*" : performOperation() {}
    case "/" : performOperation() {}
    default: break
    }

}

func performOperation(operate: (Double, Double) -> Double) {
    }

Upvotes: 0

Views: 1487

Answers (1)

PGDev
PGDev

Reputation: 24341

performOperation method accepts an argument of type (Double, Double) -> Double.

Now this argument can be any of the below:

Method-1. A closure of type (Double, Double) -> Double

Method-2. A method name having signature as (Double, Double) -> Double

The below example uses both the methods:

    func operation()
    {
        let operate = sender.currentTitle!
        switch operate
        {
        case "+" : performOperation(operate: add) //using Method-2
        case "-" : performOperation(){(a: Double, b: Double) -> Double in
            return a - b
        }//using Method-1
        default: break
        }
    }

    func add(a: Double, b: Double) -> Double
    {
        return a + b
    }

    func performOperation(operate: (Double, Double) -> Double)
    {
        let x = operate(3, 4)
        print(x)
    }

Similarly, you can use any of the 2 methods for all other cases of switch statement.

Upvotes: 1

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