C# break语句

using System;

namespace Loops {

   class Program {

      static void Main(string[] args) {
         /* local variable definition */
         int a = 10;

         /* while loop execution */
         while (a < 20) {
            Console.WriteLine("value of a: {0}", a);
            a++;

            if (a > 15) {
               /* terminate the loop using break statement */
               break;
            }
         }
         Console.ReadLine();
      }
   }
}