using System;

public class Program

{

    public static void Main()

    {

         /* local variable definition */

            int a = 10;

​

            /* while loop execution */

            while (a < 20)

            {

                Console.WriteLine("value of a: {0}", a);

                // increment a by 1 - same as a = a + 1

                a++;

                // test if a is greater then 15

                if (a > 15)

                {

                    /* when a > 15 terminate the loop using break statement */

                    break;

                }

            }

            //Console.ReadLine();

    }

}