Function Parameter Names - with in-out parameter

Question

I don't understand the last blank, someone could help me and explain me the answer?

func calc(num: inout Int) {
num = num*5
}
var a = 8
calc(num: )

Answer 1

When calling a function/method that uses an inout parameter in Swift, you need to pass the address of '&' the variable 'a' being passed to the function/method. Go to the lesson just before this question and re-read it. Be sure to check out the example code and 'try it'.

Answer 2

@chaoticDawg : Thank you for your reply and explanation, very clear !