Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

iOS Swift Enums and Structs Structs and their Methods Struct Methods

Eric Whittaker
Eric Whittaker
2,974 Points

Structs and Their Methods Challenge 2

Why doesn't this work? I don't understand. Am I using the multiplication operator wrong?

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

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

    func calculateTaxes (percentage: Double) {

      return self.amount * (percentage/100)
    }

    // add the calculateTaxes method here
    // it should accept only one parameter named 'percentage' of type Double

}
struct.swift
struct Expense {
    var description: String
    var amount: Double = 0.0

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

    func calculateTaxes (percentage: Double) {

      return self.amount * (percentage/100)
    }

    // add the calculateTaxes method here
    // it should accept only one parameter named 'percentage' of type Double

}

1 Answer

Sri Kadimisetty
Sri Kadimisetty
9,770 Points

Your calculateTaxes function's signature is missing the return part which is necessary because you are returning the calculated tax of type Double. So correct it to read -

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