Chapter 1 Challenge #5

[pwmobile]

I received the following error message based on the code:
MyPlayground.playground note: expected an argument list of type ‘(Double, Double)’
let average: Double = (a + b) / 2.0

let a: Double = 10.0
let b: Double = 10.0
let average: Double = (a + b) / 2.0

I do not understand the error even though the code looks fine to me.

[shogunkaramazov]

The above code works for me. Please run it again and let me know if you still have any issues with it. Thank you!

[pwmobile]

I found out that I had another variable “a” in my playground when I did do other challenge from the book.
I think the error message wasn’t making sense to me. It should have said that the variable was already existed.