HoppityHop.scala

import scala.io.Source
/**
 * http://www.facebook.com/jobs_puzzles/index.php?puzzle_id=7
 */
object HoppityHop{
  def main(arg:Array[String]){
    val line = Source.fromFile(arg(0)).getLine(1)

    // val Array(n) = line.split(" ").filter(_.length!=0)      

    // val r = "\\s*([0-9]+)\\s*".r
    // val r(n) = line

    // val n = line match {
    //  case r(n) => n
    // }

    // val n = "\\s*([0-9]+)\\s*".r.unapplySeq(line) match{
    //   case Some(n::_) => n
    //   case _ => ""
    // }

    // without mattern matching.
    val n = "\\s*([0-9]+)\\s*".r.unapplySeq(line).get.first


    object HoppityHop{
      def unapply(n:Int):Option[String] =
        if(n%3 == 0 && n%5 == 0) Some("Hop")
        else if(n%3 == 0) Some("Hoppity")
        else if(n%5 == 0) Some("Hophop")
        else None
    }

    (1 to (n.toInt)).foreach{
      case HoppityHop(s) => println(s)
      case _ =>
    }
  }
}