using System;

class Person 

{

    protected int id, age;

    public string name, phone;

        public Person(int num) 

        {

            id=num;

        }   

    public Person(int id,string Name) :this(id){

         name = Name;

    }

    public Person(int id,string Name,string Phone) :this(id , Name){

         phone = Phone;

    }

}

class Student : Person {

    public string std;

    public Student(int id , string name) : base(id,name){

    }

    public Student(int id , string name, string phone) : base(id,name,phone){

    }

    public Student(int id, string name, string phone,string Std) : base(id, name, phone){

        std = Std;

    }

    public void show1()

    {

    Console.WriteLine( id);

    Console.WriteLine( id + " " +name);

    Console.WriteLine( id + " " +name + " " +phone);

    Console.WriteLine( id + " " +name + " " +phone+ " " + std);

}

    }

​

​

​

 public class Program

 {

     public static void Main(string[] args){

    Student s = new Student(1,"parth","7874357432", " 10" );

    s.show1();

     }

 }

​