如何使用 Swift 在结构中打印方法的 output？

Question

I'm VERY new to programming and Swift. Why won't a simple print(getDetails()) at the bottom of the getDetails function suffice to get the output? It always returns an error "Expected '{' in body of function declaration".

Here's the code...

struct Car {
    let make:String = "MINI"
    let model:String = "COOPER"
    let year:String = "2015"
    
    var details:String {
        return year + " " + make + " " + model
    }
    func getDetails() -> String {
        return details
    }
    print(getDetails())
}

Answer 1

At the top level of a struct or class , you're only allowed to define functions and properties. For example, your let make:String = "MINI" or func getDetails() -> String { ... } are valid top-level declarations.

You are not, however, allowed to put imperative code that doesn't define a function or property (like print("") ) at the top level of a type like this.

If you were in a Swift playground, you can put imperative code at the top level of the file (not of the struct or class). So, this would be valid:

struct Car {
    let make:String = "MINI"
    let model:String = "COOPER"
    let year:String = "2015"
    
    var details:String {
        return year + " " + make + " " + model
    }
    func getDetails() -> String {
        return details
    }
}

let myCar = Car()
print(myCar.getDetails())

Since all getDetails does is return details , it's a bit superfluous, so we could refactor to just this:

struct Car {
    let make:String = "MINI"
    let model:String = "COOPER"
    let year:String = "2015"
    
    var details:String {
        return year + " " + make + " " + model
    }
}

let myCar = Car()
print(myCar.details)

Answer 2

import UIKit
import Foundation
struct Car {
   private var make = "Toyota"
  private  var model = "Camry"
    private var year = "1999"
   private var details:String {
        year + " " + make + " " + model
    }
  func getDetails () -> String {
    return details
 }
}
let a:Car = Car()
print (a.getDetails())