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

Why wont this work?! Structs + Methods please help! :(

Hello All :)

I get this error code every time: swift_lint.swift:18:22: error: cannot convert the expression's type '(percentage: FloatLiteralConvertible)' to type '(Double) -> Double'

Why is it trying to convert it? What have i done wrong?

Thank you Harland

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

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

    }
func calculateTaxes(percentage: Double) -> Double {
return (self.amount*(percentage/100)) } 
    // add the calculateTaxes method here
    // it should accept only one parameter named 'percentage' of type Double

}

  var item = Expense.calculateTaxes(percentage: 7.5) 
  var taxes = item 
        item.amount = 100

1 Answer

You to need first create an instance of Expense strut before you can call a method:

// Create instance
var item = Expense(description: "Travel Expense")

// Call method
var taxes = item.calculateTaxes(7.5)