using System;

  public class Program

    {

​

        /* Exercise 1 :  

         * Tax calculation based on gender and age.

         * "EmployeeTax" class contains properties like "Id", "Name", "Gender", "DOB", "Salary". 

         * Invoking "CalculateTax" should return different result based on the value in "Gender" and "DOB"

         * To use : RunTime Polymorphism & Inheritance  */

​

​

​

        /* Notes:

         * 1) Inputes Hard Coded in Main method

         * 2) Inheritance:

         *      Base Class-EmployeeTax

         *      Sub Class-TaxReturnCalculationByGender,TaxReturnCalculationByAge

         * 3) RunTime Polymorphism:

         *      OverRide the Base Class Virtual method "CalculateTax" in Sub-class at Run Time. 

         * 4) TaxReturn Calculation:

         *      By Gender:

         *       for Male- 20%, Female- 15%

         *      By Age:

         *       for GreaterThan 18 - 18%, LessThan 18 - 10%

         *      

         * */

​

​

        public static void Main()

        {

            EmployeeTax employeeTax = new EmployeeTax();

            employeeTax.Id = 1;

            employeeTax.Name = "Mohan Prasath";

            employeeTax.Gender = "M";

            employeeTax.DOB = Convert.ToDateTime("1992/03/28");

            employeeTax.Salary = 18000;

​

            EmployeeTax employeeTaxByGender = new TaxReturnCalculationByGender();

            employeeTaxByGender.Id = employeeTax.Id;

            employeeTaxByGender.Name = employeeTax.Name;

            employeeTaxByGender.Gender = employeeTax.Gender;

            employeeTaxByGender.DOB = employeeTax.DOB;

            employeeTaxByGender.Salary = employeeTax.Salary;

            Console.WriteLine("The Tax Return for " + employeeTaxByGender.Name + ", based on gender calculation  :" + employeeTaxByGender.CalculateTax());

​

            EmployeeTax employeeTaxByAge = new TaxReturnCalculationByAge();

            employeeTaxByAge.Id = employeeTax.Id;

            employeeTaxByAge.Name = employeeTax.Name;

            employeeTaxByAge.Gender = employeeTax.Gender;

            employeeTaxByAge.DOB = employeeTax.DOB;

            employeeTaxByAge.Salary = employeeTax.Salary;

            Console.WriteLine("The Tax Return for " + employeeTaxByGender.Name + ", based on Age calculation  :" + employeeTaxByAge.CalculateTax());

​

            Console.ReadLine();

        }

​

    }

    public class EmployeeTax

    {

        public int Id { get; set; }

        public string Name { get; set; }

        public string Gender { get; set; }

        public DateTime DOB { get; set; }

        public int Salary { get; set; }

​

        public virtual decimal CalculateTax()

        {

            decimal taxReturn = 0;

            taxReturn = Salary * 25 / 100;

            return taxReturn;

​

        }

​

        public int AgeCalculate()

        {

            int Age = 0;

            var today = DateTime.Today;

            Age = today.Year - DOB.Year;

            return Age;

        }

    }

    public class TaxReturnCalculationByGender : EmployeeTax

    {

​

        public override decimal CalculateTax()

        {

            decimal taxReturn = 0;

​

            if (Gender == "M")

            {

                taxReturn = Salary * 20 / 100;

            }

            else

            {

                taxReturn = Salary * 15 / 100;

            }

​

            return taxReturn;

​

        }

    }

    public class TaxReturnCalculationByAge : EmployeeTax

    {

        public override decimal CalculateTax()

        {

            int age = AgeCalculate();

​

            decimal taxReturn = 0;

            if (age > 18)

            {

                taxReturn = Salary * 18 / 100;

            }

            else

            {

                taxReturn = Salary * 10 / 100;

            }

​

            return taxReturn;

        }

    }