swift - binary operator * cannot be applied to operands of type Int and Double

Question

I'm trying to build a simple Swift app to calculate VAT (Value Added taxes = 20%).

func taxesFree(number: Int) -> Double {

    var textfield = self.inputTextField.text.toInt()!
    let VAT = 0.2
    var result = textfield * VAT

    return result        
}

For some reason I keep getting

Binary operator * cannot be applied to operands of type Int and Double

on the line

var result = textfield * VAT    

Answer 1

You should convert one type to the other one so both variable should be the same types:

var result: Double = Double(textfield) * VAT