using System;

​

interface IVehicle{void drive();}

interface IEngine{void drive();}

​

public class Car:IVehicle,IEngine

{

public void drive(){}

}

​

public class readonlystaticvar

{

    static readonly int vrbl;//need not initialized while declaration,can be changed thru the only defined static  constructors only once bcz we cannot write parameterized static constructors in the class.

    static readonlystaticvar() 

    {

        vrbl=0;

    }

    //below code doesnt work as we cannot have parameterised static constructors.

    /*static readonlystaticvar( int i) 

    {

        vrbl=0;

    }*/

}

​

public class readonlyvar

{

    public readonly int vrbl;//need not initialized while declaration,can be changed thru the any defined constructors any number of times.

    public readonlyvar()

    {

        vrbl=0;

    }

}

public class Program

{

    public static void Main()

    {

        const int cnst=0;

        Console.WriteLine("Hello World");

    }

}