//Use the Chain of Responsibility Pattern.
//The Runner class creates an instance of the President, VicePresident and Director classes.
//On creation of the VicePresident object, the President object is passed into the constructor of the VicePresident object.
//In the same way, the VicePresident object is passed into the constructor of the Director class.
//The object passed into the respective constructor represents the next object in the chain, from the point-of-view of the object being created.

President president = new President();
VicePresident vicePresident = new VicePresident(president);
Director director = new Director(vicePresident);

Purchase p = new Purchase("PO-0001", 350.00, "Supplies");
director.ProcessRequest(p);

p = new Purchase("PO-0002", 32590.10, "Project X");
director.ProcessRequest(p);

p = new Purchase("PO-0003", 122100.00, "Project Y");
director.ProcessRequest(p);