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iOS Swift Basics Swift Types Type Safety and Type Inference

Michael Bau
Michael Bau
3,394 Points
Posted by Michael Bau
Michael Bau
3,394 Points

In the code challenge I get the message "Use of unresolved identifier"

Hi,

This message refers to the 'product' constant.

I am unsure as to how to determine the 'product'.

Do I write:

'a' * 'b' or '120' * '33' (the numbers I have used) or 'firstValue' * 'secondValue'

Which is correct?

My 'output' constant looks like this:

let output = "The product of, (firstValue), times, (secondValue), is, (product)"

Best regards

Marlon Henry
Marlon Henry
6,885 Points

So we can see exactly what's going on...is there anyway you can show us your code?

3 Answers

Kyle Johnson
Kyle Johnson
33,528 Points
Kyle Johnson
Kyle Johnson
33,528 Points

Hi Michael,

It looks like you almost have it correct but you are missing one thing. You forgot to put the \ in front of your constants in the string. You also don't need those commas if you want to be grammatically correct. Your code should look like this:

let output = "The product of \(firstValue) times \(secondValue) is \(product)."
Michael Bau
Michael Bau
3,394 Points
Michael Bau
Michael Bau
3,394 Points

Hi Kyle,

Thanks for your answer. I tried to write the string as you suggested but still get the same error. Could there be something with the earlier constants?

My 'product' constant looks like this = let product = a * b, is this correct?

By the way, I have yet to understand how to insert screenshots in a comment. How is this done?

Best regards, Michael

Michael Bau
Michael Bau
3,394 Points
Michael Bau
Michael Bau
3,394 Points

Hi again,

I just realized that my 'product' constant was wrong. I should have typed 'firstValue' * 'secondValue' instead of 'a' * 'b'. My bad.

So, that combined with your suggested 'output' constant, did the trick. Thanks!

Best regards, Michael