[Swift] function 1-1

import UIKit

func sayHello() {

    println("hello")

}

// 1. external parameter (nameOfPerson name: String)

// 2. internal parameter (name: String)

// 2. hash prefix (#name: String)

func sayHelloTo(#name: String) ->String {

    println("Hello \(name)")

    return "Well, Hello to you to \(name)!"

}

sayHello()

println(sayHelloTo(name: "Jack"))