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 Collections and Control Flow Control Flow With Loops Working With Loops

Posted by abdulmohsen abdullah
abdulmohsen abdullah
Courses Plus Student 352 Points

i did not understand the second task

i just could not wrap my head around this task

loops.swift 
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 += 1

}

1 Answer

andren
andren
28,558 Points
andren
andren
28,558 Points

Your solution is pretty close, and arguably you figured out the hardest part. The task can be divided into two parts:

The first is to figure out how to retrieve each value from the numbers array using the counter as the index. That you have actually done successfully with the numbers[counter] code.

The second is to add that value to the sum variable, that is the part you are not doing. Instead you print the value out, which is not what the task requested.

The instructions provide two examples of how you can add one value to another sum = sum + newValue or the shorthand sum += newValue. If you use that code instead of the print code you have currently 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
}

Then your code will work.