switch实现成绩打等级

 #include <stdio.h>

 int main()
 {
     int grade;
     scanf_s("%d", &grade);
     grade = grade / ;
     switch (grade)
     {
         case :
         case :printf("A\n"); break;
         case :printf("B\n"); break;
         case :printf("C\n"); break;
         case :printf("D\n"); break;
         default:printf("F\n");break;
     }

     return ;
 }