static void Main()
{
AbstractApprover petar = new Menager();
AbstractApprover dimitar = new DivisionManager();
AbstractApprover ivan = new ExecutiveDirector();
//set successors
petar.SetSuccessor(dimitar);
dimitar.SetSuccessor(ivan);
Order smallOrder = new Order(1, 999.99, "Water delivering");
petar.ProcessRequest(smallOrder);
Order mediumOrder = new Order(2, 1001, "Fuel delivering");
petar.ProcessRequest(mediumOrder);
Order bigOrder = new Order(3, 9999, "Oil delivering");
petar.ProcessRequest(bigOrder);
Order specialOrder = new Order(4, 10001, "Tanker delivering");
petar.ProcessRequest(specialOrder);
Order nullOrder = new Order(5, null, "Test null order");
petar.ProcessRequest(nullOrder);
}