What this line means in Swift?

Question

I\'m now reading Swift 3 book and found this line there:

func sumOf(numbers: Int...) -> Int {

}

and there are just this description:

<

Answer 1

As per the above explanation the variadic arguments are variable number of argument the function takes variable number of arguments in a numbers array. so if you want to print each element you can do so by

func sumOf(numbers: Int...) -> Int {
    var sum:Int = 0

    for num in numbers {
        sum = sum + num
    }
    return sum
}

and the number of int element passed to this number may very.