C# Basic Program - Understanding For Loop

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace For_five

{

    class Program

    {

        static void Main(string[] args)

        {

            Console.WriteLine("--- For 1 ---");

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

            {

                Console.WriteLine(i);

            }

             Console.WriteLine("--- For 2 ---");

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

            {

                Console.WriteLine(i);

            }

            Console.WriteLine();

            Console.WriteLine("--- For 3 ---");

            for (int i = 0; i < 10; i += 2)

            {

                Console.WriteLine(i);

            }

            Console.WriteLine();

            Console.WriteLine("--- For 4 ---");

            for (int i = 10 - 1; i >= 0; i -= 2)

            {

                Console.WriteLine(i);

            }

            Console.WriteLine();

            Console.WriteLine("--- For 5 ---");

            for (int i = 0; i < (20 / 2); i += 2)

            {

                Console.WriteLine(i);

            }

            Console.ReadLine();

        }

        

    }

}