c语言问题
请问这段代码中case 10又什么作用？
#include<stdio.h>
int main(){
int score,grade;
printf("Input a score(0~100):");
scanf("%d",&score);
if(score>100||score<0) grade=-1;
else grade=score/10;
switch(grade){
case 10:
case 9:printf("grade=A");break;
case 8:printf("grade=B");break;
case 7:printf("grade=C");break;
case 6:printf("grade=D");break;
case 5:
case 4:
case 3:
case 2:
case 1:
case 0:printf("grade=E");break;
default:printf("The score is out of range!");
}
}
