While

Question

What does "increment count variable" mean? Thanks.

while.swift

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

// Enter your code below
while counter < 1 {
print ("counter")
}

Answer 1 · 2016-02-03T02:40:05Z

February 3, 2016 2:40am

A correct solution for this challenge is 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++
}

Answer 2 · 2016-02-03T02:41:00Z

February 3, 2016 2:41am

Hey there Mahmoud. Welcome to Treehouse.

There are a couple issues with you code for this challenge.

First, the challenge wants the while loop to run as long as the counter is less that the length of the array. So where you have "while counter < 1", you'll need to change the 1 to be the length of the array using the count method.

while counter < numbers.count {

Second, the challenge does not ask you print anything, so that line needs to be deleted. Instead, you will need to increment the counter... which brings us to your question: If you don't increment the counter variable, the loop will run forever and the app/computer will crash. After each loop iteration, you will need to add 1 to the counter, so eventually the counter will no longer be less then the length of the array. This is accomplished a few ways, but the most common would be counter++.

Once all this is done, the final code for Task 1 will look like:

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

Hope this helps and makes sense. Keep Coding! :)

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Mahmoud Rajabzadeh-Mashhadi

Mahmoud Rajabzadeh-Mashhadi

While

2 Answers

kjvswift93

kjvswift93

Jason Anders

Jason Anders