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

David Alberto Fuentes Ortiz
David Alberto Fuentes Ortiz
1,593 Points
Posted by David Alberto Fuentes Ortiz
David Alberto Fuentes Ortiz
1,593 Points

im stuck don't know

i don't know what im doing wrong or what to do

while.swift 
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++

}

1 Answer

Candace Sommer-Van Auken
Candace Sommer-Van Auken
2,032 Points
Candace Sommer-Van Auken
Candace Sommer-Van Auken
2,032 Points

You've almost got it! The only problem is in the line in the while loop that sums the numbers. It should read: sum += numbers[counter] Why? Because what you're doing is starting with the counter equal to zero. So you get the numbers array member at the zero position, and add it to sum. They you increase the counter to one and add the numbers array member at the one position to the sum, etc. Putting "sum += numbers" doesn't work because you can't add an array as though it were an integer.

I hope this helps!