C语言switch语句

#include <stdio.h>

int main () {

   /* local variable definition */
   char grade = 'B';

   switch(grade) {
      case 'A' :
         printf("Excellent!/n" );
         break;
      case 'B' :
      case 'C' :
         printf("Well done/n" );
         break;
      case 'D' :
         printf("You passed/n" );
         break;
      case 'F' :
         printf("Better try again/n" );
         break;
      default :
         printf("Invalid grade/n" );
   }

   printf("Your grade is  %c/n", grade );

   return 0;
}