C# switch语句

using System;

namespace DecisionMaking {

   class Program {

      static void Main(string[] args) {
         /* local variable deFinition */
         char grade = 'B';

         switch (grade) {
            case 'A':
               Console.WriteLine(Excellent!);
               break;
            case 'B':
            case 'C':
               Console.WriteLine(Well done);
               break;
            case 'D':
               Console.WriteLine(You passed);
               break;
            case 'F':
               Console.WriteLine(Better try again);
               break;
               default:
            Console.WriteLine(Invalid grade);
               break;
         }
         Console.WriteLine(Your grade is  {0}, grade);
         Console.ReadLine();
      }
   }
}