using System;

public class Person

{

    // Member Variables

    private string firstName;

    private string lastName;

    private string eyeColor;

    private int age;

    // Default Constructor

    public Person()

    {

        Console.WriteLine("Person constructor called. Object created");

    }

    // Parametrised Constructor

    public Person(string firstName)

    {

        this.firstName = firstName;

    }

    // Parametrised Constructor

    public Person(string firstName,string lastName)

    {

        this.firstName = firstName;

        this.lastName = lastName;

    }

    // Parametrised Constructor

    public Person(string firstName,string lastName,string eyeColor)

    {

        this.firstName = firstName;

        this.lastName = lastName;

        this.eyeColor = eyeColor;

    }

    // Parametrised Constructor

    public Person(string firstName,string lastName,string eyeColor,int age)

    {

        this.firstName = firstName;

        this.lastName = lastName;

        this.eyeColor = eyeColor;

        this.age = age;

    }

    // Method 

    public void Introduce()

    {

        if(firstName != null && lastName != null && age !=0 && eyeColor !=null)

        Console.WriteLine("Hi, I am {0} {1}. My eye color is {2} and I am {3} years old",firstName,lastName,eyeColor,age);

        else if(firstName != null && lastName != null && eyeColor !=null)

        Console.WriteLine("Hi, I am {0} {1}. My eye color is {2}",firstName,lastName,eyeColor);

        else if(firstName != null && lastName != null)

        Console.WriteLine("Hi, I am {0} {1}.",firstName,lastName);

        else if(firstName != null)

        Console.WriteLine("Hi, I am {0}.",firstName);

    }

}

public class Program

{

    public static void Main()

    {

        Person person = new Person();

        person.Introduce();

        Person mosh = new Person("Mosh");

        mosh.Introduce();

        Person rayees = new Person("Rayees","Bhat");

        rayees.Introduce();

        Person asif = new Person("Asif","Khan","Brownn");

        asif.Introduce();

        Person shakir = new Person("Shakir","lone","Amber",26);

        shakir.Introduce();

    }

}