using System;

​

namespace PersonNamespace {

    public class Person {

        protected string fullName;

        private int age;

​

        public Person(string name, int age) {

            this.fullName = name;

            this.age = age;

        }

        public void DisplayInfo() {

            Console.WriteLine(this.fullName);

            Console.WriteLine(this.age);

        } 

    }

​

    public class Student : Person {

        private long studentID;

        private string studentProgram;

​

        public Student(string name, int age, 

            long id, string program) : base (name, age) {

            this.studentID = id;

            this.studentProgram = program;

        }

​

        public void DisplayStudentInfo() {

            DisplayInfo();

            Console.WriteLine(this.studentID);

            Console.WriteLine(this.studentProgram);

        }

    }

​

    public class DemoInheritance {

        public static void Main() {

            Student student = new Student("Ash",12,123,"BSIT");

            student.DisplayStudentInfo();

        }

    }

}