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Here is my code : 

var firstNumber: Double
var secondNumber: Double
var result: Double

var delegate: ComputeDelegate!

init(delegate: ComputeDelegate){

    self.delegate = delegate

}

func add(result: Double) -> Double {

    result = firstNumber + secondNumber

    return result

}

Here is the exact error : Cannot assign to value: 'result' is a 'let' constant

Thanks in advance! - Rookie here... ;) -

Dani Turc
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1 Answers1

2

You are trying to set value to your InputValue which is read only. You should change your method like this:

func add() -> Double {

    return firstNumber + secondNumber

}
ridvankucuk
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  • Ayway, if I'm doing this, it gives me another error : var delegate: ComputeDelegate! init(delegate: ComputeDelegate){ self.delegate = delegate } --- HERE ---> Return from initializer without initializing all stored properties (this is the error) – Dani Turc Mar 28 '16 at 13:40