using System;

/*************************************************
* The Employee class entends Person and implements
* IPayable, but since it defers the actual
* implementation of IPayable's Pay() method
* to derived classes it must be declared an
* abstract class.
**************************************************/

public abstract class Employee : Person, IPayable {
	private String _employeeNumber;
	
	public String EmployeeNumber {
		get { return _employeeNumber; }
		set { _employeeNumber = value; }
	}
	
	public Employee(String firstName, String middleName, String lastName, 
                  Sex gender, DateTime birthday, String employeeNumber):
                  base(firstName, middleName, lastName, gender, birthday){
	  EmployeeNumber = employeeNumber;	
	}
	
	
	public abstract double Pay(); // map IPayable.Pay() to an abstract method 
	                               // and defer implementation
	
} // end Employee class definition