学生成績分類(等級)

#include 
#include 

int main()
{
   int score;
   scanf ("%d",&score);
   if(score<=100&&score>=0)
   {switch (score/10)
    {
       case 10:
       case 9:printf("A
");break;
       case 8:printf("B
");break;
       case 7:printf("C
");break;
       case 6:printf("D
");break;
       default :printf("E
");break;
    }
   }else printf("error
");
    return 0;
}