interface Printable
  method print()
  method tag() as byte
end interface

interface Resettable
  method reset()
end interface

class Counter implements Printable, Resettable
  private word value

  public method init(start as word)
    self.value = start
  end method

  public method print()
    print self.value
  end method

  public method tag() as byte
    return 1
  end method

  public method reset()
    self.value = 0
  end method
end class

class Ticker implements Printable
  public method print()
    print 7
  end method

  public method tag() as byte
    return 2
  end method
end class

program Main
  var count as Counter
  var tick as Ticker
  var shown as Printable
  var zeroed as Resettable
  var ok as boolean

  count = new Counter(10)
  tick = new Ticker()
  shown = count
  shown.print()
  ok = shown.tag() = 1
  zeroed = count
  zeroed.reset()
  shown = tick
  shown.print()
  ok = shown.tag() = 2
  delete shown
  delete count
end program