using System;

​

public interface IPerson

    {

        void Talk();

        int GetAge();

        void SetAge(int Age);

    }

    public abstract class Person

    {

        public string Name { get; set; }

        protected int Age { get; set; }

        public int GetAge()

        {

            return this.Age;

        }

        public void SetAge(int Age)

        {

            this.Age = Age;

        }

        public abstract void Eat();

    }

    public class Student : Person, IPerson

    {

        public Student(string Name, int Age)

        {

            this.Name = Name;

            this.Age = Age;

        }

        public void Talk()

        {

            Console.WriteLine($"Hello there! I'm {this.Name} and I'm {this.Age} Years Old.");

        }

        public override void Eat()

        {

            Console.WriteLine("Eating");

        }

        public override string ToString()

        {

            return "Hello! My name is " + this.Name;

        }

    }

    public class Teacher : Person, IPerson

    {

        protected string Subject { get; set; }

        public Teacher(string name, int age)

        {

            Name= name;

            Age= age;

        }

        public Teacher(string name, string subject, int age) : this(name, age)

        {

            Subject = subject;

        }

        public void Talk()

        {

            Console.WriteLine($"Hello there! I'm {this.Name} and I Teach {this.Subject}.");

        }

        public string GetSubject()

        {

            return this.Subject;

        }

        public void SetSubject(string Subject)

        {

            this.Subject = Subject;

        }

        public override void Eat()

        {

            Console.WriteLine("Eating");

        }

        public override string ToString()

        {

            return $"Hello! My name is {this.Name}. I'm your {this.Subject} teacher.";

        }

    }

public class Program

{

    public static void Main()

    {

        Teacher bhavin = new Teacher("Bhavin","DotNet",23);

        Student vanita = new Student("Vanita", 21);

        Teacher jay = new Teacher("Jay", 22);

        Student manish = new Student("Manish", 22);

        bhavin.Talk();

        bhavin.Eat();

        Console.WriteLine( bhavin.ToString());

        vanita.Talk();

        Console.WriteLine(vanita.ToString());

​

        Console.WriteLine("jay's Subject" + jay.GetSubject());

        jay.SetSubject("Angular");

​

        jay.Talk();

        Console.WriteLine(jay.ToString());

    }

}