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Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today. # I cannot seem to figure out part 2 of this challenge...

I'm trying to retrieve the sum for the numbers inside of the array and cannot seem to find how. This is the challenge associated with the while and repeat loops.

while.swift
```let numbers = [2,8,1,16,4,3,9]
var sum = 0
var counter = 0

while counter < numbers.count {
print(numbers)
counter++
}

repeat {
print (numbers[index])
numbers++
} while counter < numbers.count
```

You are close first you need to delete your repeat-while loop you only need one while loop for this task

Your code should look something like this:

```let numbers = [2,8,1,16,4,3,9]
var sum = 0
var counter = 0

while counter < numbers.count {
sum = sum + numbers[counter]
counter++
}
```

Above you access the item in the numbers array with the counter variable.

So when counter = 0 the value of numbers[counter] = 2

counter = 0 numbers[counter] = 2

counter = 1 numbers[counter] = 8

counter = 2 numbers[counter] = 1

counter = 3 numbers[counter] = 16

etc it will stop once counter is equal to the size of the numbers array

```sum = sum + numbers[counter]
```

adds the previous sum together with the value of numbers[counter] Your while counter was good for the first task in the challenge.

But for the second task they were asking you to compute the sum within the while loop. If you did that your code would end up looking something like this.

```let numbers = [2,8,1,16,4,3,9]
var sum = 0
var counter = 0