using System;

​

​

class customer

{

  public string Firstname;

  public string Lastname;

  public customer():this("nofirstname","nolastname")

  {

  }

  public customer(string firstname,string lastname)

  {

    this.Firstname=firstname;

    this.Lastname=lastname;

  }

  public void printfullname()

  {

      Console.WriteLine("the fullname of the customer is {0} {1}",this.Firstname,this.Lastname);

  }

​

}

​

public class Program

{

    public static void Main()

    {

         customer c1=new customer("salvi","marulf");

         c1.printfullname();

         customer c2=new customer();

         c2.printfullname();

    }

}