Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community!

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS Swift Enums and Structs Structs and their Methods Struct Methods

What am I doing wrong?

I can't figure out what's wrong with my code. It says there's an error but doesn't specify what it is.

1 Answer

Marina Alenskaja
Marina Alenskaja
9,320 Points

Hey. So next time try showing your current code - it makes it easier to help - without giving you the answer completly :-)

But here is what the answer should look like:

struct Expense {
    var description: String
    var amount: Double = 0.0

    init (description: String) {
        self.description = description

    // add the calculateTaxes method here
    // it should accept only one parameter named 'percentage' of type Double
    func calculateTaxes(percentage: Double) -> Double {
         return(self.amount * (percentage/100))
var item = Expense(description:"Hotel")
item.amount = 100.00

var taxes = item.calculateTaxes(7.5)