When creating an object gives an error

If you don't want to create a custom initializer, then you shouldn't call a custom initializer.

Given your class definition, you need:

var myAcc = Account()
myAcc.capital = 1000.0
myAcc.rate = 0.1

Just need to create a convenience initializer.

class Account {
    var capital = 0.0
    var rate = 0.0

    var profit: Double {
        get { 
            return capital + capital * rate
        }
        set(newProfit) {
            self.capital = newProfit / (1 + rate)
        }
    }

    convenience init(capital: Double, rate: Double) {     
     
        self.init()   
        self.capital = capital
        self.rate = rate
}

if you declare Account as a struct, you can call directly:

var myAcc = Account (capital: 1000.0, rate: 0.1)

Got it!

If I do not use the initializer, I should not pass arguments to it. Then, to change the values, I must directly access the properties.

var myAcc = Account ()
myAcc.capital = 100
myAcc.rate = 0.1

Thank so much!

Sorry for an unnecessary question. I did not notice at once that you wrote the same code to which I came a few minutes later))

Thanks!

Read Swift language reference manual ; there is a very clear explanation on initializers ; that will help you a lot to understand completely how this "magic" works.

And don't forget to close the thread.

close the thread of this topic? How?

Click "marked as correct" in the correct answer.