Swift 2.0 Collections and Control Flow - While Loops

Question

Now that we have the while loop set up, it's time to compute the sum! Using the value of counter as an index value, retrieve each value from the array and add it to the value of sum.

For example: sum = sum + newValue. Or you could use the compound addition operator sum += newValue where newValue is the value retrieved from the array.

Completed first task and I am stuck on the second part of this challenge task, asking to add the value of sum to a new value

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 {
  print(numbers[counter])
  counter++
  }

while counter < numbers.count {
  var newValue = numbers[counter]
  sum += newValue
  counter++
}

Answer 1 · 2016-03-12T22:43:30Z

March 12, 2016 10:43pm

Hey Ralph,

I think you may be overthinking this one a bit. The second part of the challenge is pretty much like the first, except with a variable sum instead of a print statement. So, you only need to add one line of code to the while loop you wrote for Task 1.

The challenge task question was just using newValue as an example. But, what you need is to add all the numbers being pulled from the array to each other. You are already printing each number, so in the same way you are getting those numbers, we can add them to each other with sum += numbers[counter] (just like the print).

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])
  sum += numbers[counter]
  counter++
}

Hope that helps

Answer 2 · 2016-03-12T22:43:38Z

March 12, 2016 10:43pm

You don't need two while loops. Just change your print statement from the first while loop to the addition. You also don't need to assign the numbers[counter] to a new variable. Easy as 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 3 · 2016-12-19T20:35:27Z

December 19, 2016 8:35pm

keep things simple and i would suggest do it like: while counter < numbers.count { counter += 1}

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Ralph Nicholson

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Swift 2.0 Collections and Control Flow - While Loops

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Jason Anders

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Ralph Nicholson

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Paul Brazell

Paul Brazell

Ralph Nicholson

Ralph Nicholson

irfan Rabbani

irfan Rabbani