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Start your free trial###### Ralph Nicholson

812 Points# Swift 2.0 Collections and Control Flow - While Loops

Now that we have the while loop set up, it's time to compute the sum! Using the value of counter as an index value, retrieve each value from the array and add it to the value of sum.

For example: sum = sum + newValue. Or you could use the compound addition operator sum += newValue where newValue is the value retrieved from the array.

Completed first task and I am stuck on the second part of this challenge task, asking to add the value of sum to a new value

```
let numbers = [2,8,1,16,4,3,9]
var sum = 0
var counter = 0
// Enter your code below
while counter < numbers.count {
print(numbers[counter])
counter++
}
while counter < numbers.count {
var newValue = numbers[counter]
sum += newValue
counter++
}
```

## 3 Answers

###### Jason Anders

Treehouse Moderator 145,854 PointsHey Ralph,

I think you may be overthinking this one a bit. The second part of the challenge is pretty much like the first, except with a variable `sum`

instead of a `print`

statement. So, you only need to add one line of code to the `while loop`

you wrote for Task 1.

The challenge task question was just using `newValue`

as an example. But, what you need is to add all the numbers being pulled from the array to each other. You are already printing each number, so in the same way you are getting those numbers, we can add them to each other with `sum += numbers[counter]`

(just like the print).

```
let numbers = [2,8,1,16,4,3,9]
var sum = 0
var counter = 0
// Enter your code below
while counter < numbers.count {
print(numbers[counter])
sum += numbers[counter]
counter++
}
```

Hope that helps

###### Paul Brazell

14,371 PointsYou don't need two while loops. Just change your print statement from the first while loop to the addition. You also don't need to assign the numbers[counter] to a new variable. Easy as 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++
}
```

###### Ralph Nicholson

812 PointsThanks Paul, appreciate it!

###### irfan Rabbani

656 Pointskeep things simple and i would suggest do it like: while counter < numbers.count { counter += 1}

## Paul Brazell

14,371 Points## Paul Brazell

14,371 PointsYep! You can even take out that print statement too

## Ralph Nicholson

812 Points## Ralph Nicholson

812 PointsThanks Jason. Definitely over thinking it!