Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS Swift 2.0 Collections and Control Flow Control Flow With Loops Working with Loops

Posted by Khalid Naseem
Khalid Naseem
Courses Plus Student 477 Points

while counter < 7 { counter++ }

I have this so far: while counter < 7 { counter++ } how do i get the sum of the array?

while.swift 
let numbers = [2,8,1,16,4,3,9]
var sum = 0
var counter = 0
// Enter your code below
while counter < 7 { 
 counter++
}

2 Answers

Anjali Pasupathy
Anjali Pasupathy
28,883 Points
Anjali Pasupathy
Anjali Pasupathy
28,883 Points

You need to use numbers.count instead of 7 in the condition, and you need to add numbers[counter] to sum and store that value back in sum in the while loop before count++.

while counter < 7 {  // REPLACE 7 WITH numbers.count
// PUT LINE TO ADD numbers[counter] TO sum AND STORE THAT VALUE IN sum HERE
 counter++
}

I hope this helps!

Alexander Davison
Alexander Davison
65,469 Points
Alexander Davison
Alexander Davison
65,469 Points

You are doing a great job! However, instead of using the integer 7, the code challenge wants you to get the length by using the property "count". For the second task, you should increase the "sum" variable by the index "counter" of the numbers array. Try this code:

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++
}

Hope that helps! :dizzy: