using System;

​

namespace MyApplication

{

 public class Person 

  {

​

     protected int id;

    public string name,phone;

     public override string ToString()

{

    return id+" "+name+" "+phone+" " ;

}

  public Person(int ID)

  {

    id = ID;

  }

    public Person(int ID,string Name) : this(ID)

    {

        name=Name;

    }

    public Person(int ID,string Name,string Phone) : this(ID,Name)

    {

        phone=Phone;

    }

 }

public class Student : Person 

{

     public string Std;

     public Student(int ID,string Name) : base(ID)

     {

         name = Name;

     }

     public Student(int ID,string Name,string Phone) : base(ID,Name)

     {

        Phone = phone;

     }

     public Student(int ID,string Name,string Phone,string std) : base(ID,Name,Phone)

     {

         Std = std;

     }

     public void  Go()

     {

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

     }

}

​

public class xyz

{

   public  static void Main(string[] args)

    {

       Person a = new Person(10,"deep","6354041276");

     Student q = new Student(1,"bhavy","6354041276","12");

       Console.WriteLine(q.ToString());

       Console.WriteLine(a.ToString());

    }

}

}

​

​

​

​