<?php
class Punkt
{
   function __construct(private $x = 0.0, private $y = 0.0) { }

   function verschieben($dx, $dy)
   {
      $this->x += $dx;
      $this->y += $dy;
   }

   function __toString()
   {
      return "($this->x / $this->y)";
   }
}
?>