stuck

You were almost there! You only needed to add the specific numbers to the sum variable. Something like this:

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

// Enter your code below
while counter < numbers.count {
  sum += numbers[counter]
  counter += 1
}

So close!

In my opinion you did the hard part. Your while loop is going to run 7 times.

because numbers.count will return the total count of the array which is 7.

The first iteration through the loop counter will be 0, second it will be 1, and so on until 6.

What you want to do is use the counter number as an index number when you reference the array.

To solve this challenge it would be: 2+8+1 etc. Or numbers[0] + number[1] ....+ numbers[6] (Index numbers start at 0 in arrays, so an array of count 7 will have the last index number at position 6.

So what you can do it take the var sum and set it equal to itself plus numbers[counter]. Than you will want to run counter+= 1

so in the while loop it will look like:

sum = numbers[counter] + sum counter += 1

the first iteration will look like this in numbers:

sum now is equal to = numbers[0] + 0 -note numbers[0] takes the first number of the array of 2 -note 0 is what sum currently is

the second iteration will look like this:

sum is now equal to = numbers[1] + 2