using System;

​

public class Program

{

    public static void Main()

    {

        for (int i = 0; i < 10; i++)

        {

            Console.WriteLine(i); //prints  0-9

        }

​

        Console.WriteLine(Environment.NewLine);

        for (int i = 0; i <= 10; i++)

        {

            Console.WriteLine(i); //prints  0-10

        }

​

        Console.WriteLine(Environment.NewLine);

        for (int i = 10 - 1; i >= 0; i--) //decrement loop

        {

            Console.WriteLine(i); //prints 9-0

        }

​

        Console.WriteLine(Environment.NewLine);

        //for (; ; )

        {

        // All of the expressions are optional. This statement

        //creates an infinite loop.*

        //      

        }

    }

}