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

Posted by Arthur Kwok Wai Chui
Arthur Kwok Wai Chui
1,462 Points

bummer

can't pass this question let numbers = [2,8,1,16,4,3,9] var sum = 0 var counter = 0 var newValue = numbers[counter]

// Enter your code below while counter <= numbers.count { sum = sum + newValue counter++ }

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

// Enter your code below
while counter <= numbers.count
{
  sum = sum + newValue
  counter++
}

1 Answer

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

The newValue variable is only going to be one value for this entire script. But if you put the newValue variable inside of the while loop, it will keep updating its value. Try doing that :)

Here's the new code:

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

// Enter your code below
while counter <= numbers.count
{
  var newValue = numbers[counter]
  sum = sum + newValue
  counter++
}

Good luck, Alex

Arthur Kwok Wai Chui
Arthur Kwok Wai Chui
1,462 Points

Thank you for your prompt reply. However, it still doesn't work. :-(

Alexander Davison
Alexander Davison
65,469 Points

Oh whoops I meant to say this code :smile:

You only are allowed to say "var" once for one variable in Swift, and the while loop makes it so the var keyword is used multiple times for that variable :)

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

var newValue = numbers[counter]

// Enter your code below
while counter <= numbers.count
{
  newValue = numbers[counter]
  sum = sum + newValue
  counter++
}
Alexander Davison
Alexander Davison
65,469 Points

Updated!