// Compiling this file demo.scala with 
//
//     scalac demo.scala
//
// produces a JVM byte-code program called demo.class
//
// Running the program with
//
//    scala demo 
//
// results in the string "Hello world" being sent to the standard output
//
// Running the program with
//
//   scala demo Joe
//
// results in the string "Hello Joe" being sent to the standard output


object demo {
  val greetings = "Hello world"
  
  def main(args : Array[String]) {
    println
    if (args.length == 0) 
      printGreetings
    else
      println("Hello " + args(0))
    println
  }

  def printGreetings {
  	println(greetings)
  }
}