class Time1ab(private[this] var z:Int){
if(z<0) z=0
def hour: Int=z
def hour_=(x:Int){
  if(x>0){
      z=x
    }
    else{z=0}
}
}
object Time1ab{
def apply(h:Int)=new Time1ab(h)
}


//main
object app {
  def main(Args:Array[String]) {
    val g = Time1ab(-3)
    g.hour
    println(g.hour)
  }
}