using System;

namespace tutorialspoint

{

   public abstract class Person

   {

      public abstract string Name

      {

         get;

         set;

      }

      public abstract int Age

      {

         get;

         set;

      }

   }

   class Student : Person

   {

      private string code = "N.A";

      private string name = "N.A";

      private int age = 0;

      // Declare a Code property of type string:

      public string Code

      {

         get

         {

            return code;

         }

         set

         {

            code = value;

         }

      }

      // Declare a Name property of type string:

      public override string Name

      {

         get

         {

            return name;

         }

         set

         {

            name = value;

         }

      }

      // Declare a Age property of type int:

      public override int Age

      {

         get

         {

            return age;

         }

         set

         {

            age = value;

         }

      }

      public override string ToString()

      {

         return "Code = " + Code +", Name = " + Name + ", Age = " + Age;

      }

   }

   public class ExampleDemo

   {

      public static void Main()

      {

         // Create a new Student object:

         Student s = new Student();

         // Setting code, name and the age of the student

         s.Code = "001";

         s.Name = "Zara";

         s.Age = 9;

         Console.WriteLine("Student Info:- {0}", s);

         //let us increase age

         s.Age += 1;

         Console.WriteLine("Student Info:- {0}", s);

         Console.ReadLine();

      }

   }

}