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iOS

Posted by samarth sharma
samarth sharma
1,758 Points

stuck at while loops

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.

this was my code:

let numbers = [2,8,1,16,4,3,9]

var sum = 0

var counter = 0


while    counter < numbers.count

{

    counter++

    print(numbers[0...6])

}

var newValue = numbers[counter]

sum += newValue

3 Answers

samarth sharma
samarth sharma
1,758 Points

figured it out thanks for your reply though..

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

while counter < numbers.count{
    print(numbers[counter])
    sum += numbers[counter]
    counter++


}

print(sum)
Caleb Kleveter
Caleb Kleveter
Treehouse Moderator 37,862 Points

samarth sharma , I thought I might let you know I marked your answer as best, if you ever have any you answer to yourself like you just did, you should mark it also.

I also formatted the code with 3 back ticks (`) and the name of the language, then the code, then 3 more back ticks.

Akshat Jain
Akshat Jain
12,819 Points
Akshat Jain
Akshat Jain
12,819 Points

There are several things wrong with your code:

while counter { ... }

Will never terminate because it is always true

print(numbers[0...6])

Is unnecessary

var newValue = numbers[counter]

sum += newValue

Cannot be outside the loop if you want to iterate over the array and you can combine the statements into one as I have done below

let numbers = [2, 8, 1, 16, 4, 3, 9]

var sum = 0
var counter = 0

while counter < numbers.count {
    sum += numbers[counter]
    counter += 1
}

print(sum)
samarth sharma
samarth sharma
1,758 Points
samarth sharma
samarth sharma
1,758 Points

thanks caleb, will do in future !

i didn't understand the 3 back ticks though

could you elucidate ?

Caleb Kleveter
Caleb Kleveter
Treehouse Moderator 37,862 Points

Just above the tab key on the top left side of the key board, there is a key for the tilda (~), and back tick (`).

You can also Google 'back tick key' and there should be some images.