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! While you're at it, check out some resources Treehouse students have shared here.

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

Colin Adler
Colin Adler
2,225 Points
Posted by Colin Adler
Colin Adler
2,225 Points

Quiz broken?

I have tried this on multiple computers, PC and Mac. Whenever I get to the second part of the quiz, no matter what I do it always throws an error. When the same code is thrown in Xcode, it works fine. I was wondering if there was a problem with the quiz, or I am missing something.

Thanks in advance, Colin

edit: I would like to add that whenever I go into the debug tab, it does not show anything

struct.swift 
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) {
    self.amount * (percentage/100)
  }
}

2 Answers

Stone Preston
Stone Preston
42,016 Points
Stone Preston
Stone Preston
42,016 Points

task 2 states : Add a Double as a return type to the calculateTaxes method and within the method return the following expression: (self.amount * (percentage/100)).

you need to add the return type to the function (by placing -> Double at the end of the function header), as well as the return keyword so that the expression actually gets returned:

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
    // add the return type and return keyword
    func calculateTaxes(percentage: Double) -> Double {
     return self.amount * (percentage/100)
    }
}

before you had

func calculateTaxes(percentage: Double) {
    self.amount * (percentage/100)
  }

which, as you can see, is missing the return type as well as the return keyword. the function simply executes the line of code, it does not return anything

Colin Adler
Colin Adler
2,225 Points
Colin Adler
Colin Adler
2,225 Points

Wow thanks for the fast response! Seems really dumb now that I missed that.

Stone Preston
Stone Preston
42,016 Points
Stone Preston
Stone Preston
42,016 Points

no problem, glad I could help