![#include<stdio.h>
int main(){float score;char grade;for(int i=0;i<7;i++){printf("请输入成绩：");scanf("%f",&score);while(score>100||score<0){printf("\n输入的成绩有误，请重新输入：");scanf("%f",&score);}switch((int)(score/10)){case 10: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%.1f对应的等级是%c\n",score,grade);}	return 0;}](https://img-blog.csdnimg.cn/fd9ec7129b614869bf042eb770a3d2fb.png)