using System;

public class Program

{

    public static void Main()

    {

        //Sample Code: While

            // initialize the counter

            int number = 1;

​

            // continue to print the counter until it's 4

            while (number < 4)

            {

                Console.WriteLine(number);

                number++;

            }

            Console.WriteLine("=====================");

​

            //Sample Code: While & Sum

            int sum = 0;

            int counter = 1;

            while (counter < 11)

            {

                //Console.WriteLine(number);

                sum = sum + counter;

                counter++;

            }

            Console.WriteLine("the sum of the first 10 numbers is: " + sum);

            Console.WriteLine("=====================");

​

            //Sample Code : For loop

            int i;

            //Print from 1 to 10

            for (i = 1; i < 10; i++)

            {

                Console.WriteLine("The current index i is: " + i);

            }

            Console.WriteLine("");

​

            //update can be other than ++

            for (i = 0; i <= 10; i += 5)

            {

                Console.WriteLine("The current index i is: " + i);

            }

            Console.WriteLine("");

​

            //initial value can be different

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

            {

                Console.WriteLine("The current index i is: " + i);

            }

            Console.WriteLine("=====================");

    }

}