求救啊，各位大神，明天考试啊，这题最后一句语句错哪了？

#include<stdio.h>
#include<stdio.h>
#include<math.h>
main()
{ int score,t;
printf("sdfsdf");
do
scanf("%d",&score)
; while(score<0||score>100);
t=score/10;
switch(t)
{ case 10:printf("优\n");break;
case 9:printf("优\n");break;
case 8:printf("良\n");break;
case 7:printf("中\n");break;
case 6:printf("及格\n");break;
default:printf("不\n");break;
}
}