c语言，给出一百分制成绩，要求输出成绩等级，代码总是报错

#include  
int main( )
 {float score; 
  char grade;
  printf("请输入学生成绩:"); 
  scanf("%f",&score);
  while(score>100||score<0)
  printf("\n输入有误，请重输:"); 
  scanf("%f",&score);
  }
   switch((int)(score/10))
   {case 10:break;
    case 9:grade='A':break; 
    case 8:grade='B':break; 
    case 7:grade='C':break; 
    case 6:grade='D':break; 
    case 5: 
    case 4: 
    case 3:
    case 2: 
    case 1:
    case 0:grade='E';
 }
printf("成绩是%5.1f，相应的等级是%c\n",score.grade); 
return 0;
}

switch这一行总是报错，网上查到的都没用，求问
报错内容，expected unqualified-id before 'switch'

按照你这，main在这里就结束了

11的 } 去掉

十一行的“{”删除
break前的“：”全部改为“；”
25行grade前的“.”改为“，”