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

San Francisco
San Francisco
28,373 Points
Posted by San Francisco
San Francisco
28,373 Points

Working with loops Challenge Task 2 of 2

Please provide a working solution thanks

Challenge Task 2 of 2 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. https://teamtreehouse.com/library/swift-20-collections-and-control-flow/control-flow-with-loops/working-with-loops

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

while counter > 0 {
print(sum)
counter++
}
while counter < numbers.length {
sum += numbers[counter]
counter++
}

1 Answer

Chase Marchione
Chase Marchione
155,055 Points
Chase Marchione
Chase Marchione
155,055 Points

The Treehouse compiler produces the following error:

swift_lint.swift:11:17: error: value of type '[Int]' has no member 'length'
while counter < numbers.length {
                ^~~~~~~ ~~~~~~

You're very close: you have the right logical idea, but .length is not a property that the Int array is recognized as having.

(pssst... it does have a .count property that counts the number of elements the array has.)

Hope this helps!