using System;

public class Program

{

    public static void Main()

    {

        Customer c1=new Customer();

        c1.PrintFullName();

        Customer c2=new Customer("John","Abraham");

        c2.PrintFullName();

        Customer c3=new Customer(5);

        Customer c4=new Customer(34.56F);

    }

}

​

class Customer

{

    //state -fields

    string firstName;

    string lastName;

    int i;

    float f;

    //explicit default constructor

    public Customer():this("no fn provided", "no ln provided")

    {

    }

    //constructor which takes 2 parameters--parameterized constructor

    //Constructors should have the same name as that of the class name

    //constructors are overloaded based on type and number of parameters.

    public Customer(string fn, string ln)

    {

        this.firstName=fn;

        this.lastName=ln;       

    }

    public Customer(int num)

    {

        this.i=num;

        Console.WriteLine(num);

    }

    public Customer(float n)

    {

        this.f=n;

        Console.WriteLine(n);

    }

​

    //methods--behaviour

    public void PrintFullName()

    {

        Console.WriteLine("Full Name: "+this.firstName+" "+this.lastName);

    }

    //destructors are used to release any resources that your class was holding  during its lifetime

    ~Customer()

    {

        //clean up code

    }

}