using System;

using System.Text;

​

namespace PayRollSystemManagement

{

    public abstract class Employee

    {

        public string Name { get; set; }

​

        public string Ssn { get; set; }

​

        // two-argument constructor

        public Employee(string name, string ssn)

        {

            Name = name;

            Ssn = ssn;

        }

​

        //Overriding System Object class method...

        public override string ToString()

        {

            return Name + "nSocial security number: " + Ssn;

        }

​

        // abstract method overridden by concrete subclasses       

        public abstract double earnings();

    // no implementation is allowed here, derived calss must override this method!

    } // end abstract class Employee

​

    public class SalariedEmployee : Employee

    {

        public double WeeklySalary { get; set; }

​

        // three-argument constructor

        public SalariedEmployee(string name, string ssn, double salary) : base(name, ssn)

        {

            WeeklySalary = salary; // set weekly salary

        }

​

        //Must Override base class method                                                          

        public override double earnings()

        {

            return WeeklySalary;

        }

​

        //Overriding BaseClass ToString Method                                                   

        public override string ToString()

        {

            string s = "Salaried employee: " + base.ToString() + "nWeekly salary " + string.Format("${0:0.00}", WeeklySalary) + string.Format("nEarned ${0:0.00}", earnings()) + "n";

            return s;

        }

    // end method tostring                                    

    } // end class SalariedEmployee//

​

    //define and Create 'HourlyEmployee' class 

    //{

    //To do

    // define property for storing 'wage' and 'hours'

    // define constructor method

    // Override the calculate earnings method; 

    // Override ToString() method.                                                                                                  

    //}

    //define and Create 'CommissionEmployee' class 

    //{

    //To do

    // define property for 'GrossSales' and 'CommitionRate'

    // define constructor method

    // Override the calculate earnings method; 

    // Override ToString() method.

    //}

    //define and Create 'BasePlusCommissionEmployee' class 

    //{

    //To do

    // define property for 'BaseSalary'

    // define constructor method

    // Override the calculate earnings method; 

    // Override ToString() method.                                         

    //}

    class Program

    {

        static void Main(string[] args)

        {

            //Create subclass objects

            SalariedEmployee salariedEmployee = new SalariedEmployee("Mahbub Murshed", "111-22-3333", 800.00);

            HourlyEmployee hourlyEmployee = new HourlyEmployee("Michael Jackson", "111-22-4444", 16.75, 45);

            CommissionEmployee commissionEmployee = new CommissionEmployee("Susan Harper", "444-44-4444", 10000, .06);

            BasePlusCommissionEmployee basePlusCommissionEmployee = new BasePlusCommissionEmployee("Manpreet Kaur", "777-77-7777", 5000, .04, 300);

            Console.WriteLine("Employees processed individually:n");

            Console.WriteLine(salariedEmployee);

            Console.WriteLine(hourlyEmployee);

            Console.WriteLine(commissionEmployee);

            Console.WriteLine(basePlusCommissionEmployee);

            //Create an Employee array

            var employees = new Employee[4];

            //Initialize array with different Employees

            employees[0] = salariedEmployee;

            employees[1] = hourlyEmployee;

            employees[2] = commissionEmployee;

            employees[3] = basePlusCommissionEmployee;

            Console.WriteLine("nUtilise polymorphism to iterate across different employees:n");

            //Process every element in the array

            foreach (var currentEmployee in employees)

            {

                // Check if employee is a BasePlusCommissionEmployee

                if (currentEmployee is BasePlusCommissionEmployee)

                {

                    // downcast Employee reference to BasePlusCommissionEmployee reference

                    BasePlusCommissionEmployee employee = (BasePlusCommissionEmployee)currentEmployee;

                    employee.BaseSalary = 1.30 * employee.BaseSalary;

                    Console.WriteLine("New base-salary with 30% increase is: $" + employee.BaseSalary);

                } // end if

​

                Console.WriteLine(currentEmployee); // invokes tostring   

            } // end for

​

            Console.WriteLine();

            // Get Employee type from employees array

            for (int j = 0; j < employees.Length; j++)

                Console.WriteLine("Employee {0} is {1}", j + 1, employees[j].GetType().Name);

        }

    }

}