#include <stdio.h>
int main()
{
int score, m;
scanf("%d", &score);
while (score < 0 || score > 100){
printf("Error! Retry!\n");
scanf("%d", &score);
}
m= score / 10;
if (m>= 9)
printf("Grade is A!\n");
switch(m){
case 0: printf("Grade is E!\n"); break;
case 1: printf("Grade is E!\n"); break;
case 2:?printf("Grade is E!\n"); break;
case 3:?printf("Grade is E!\n"); break;
case 4:?printf("Grade is E!\n"); break;
case 5: printf("Grade is E!\n"); break;
case 6: printf("Grade is D!\n"); break;
case 7: printf("Grade is C!\n"); break;
case 8: printf("Grade is B!\n"); break;
}
return 0;
}
擴展資料：
其他實現輸出成績等級‘A'、’B‘、'C'、‘D'、'E’。90分以上為A,80~89分為B，70~79分為C，60~69分為D，60分壹下為E的方法：
#include <stdio.h>
int main()
{
int score;
scanf("%d", &score);
while (score < 0 || score >100){
printf("Error! Retry!\n");
scanf("%d", &score);
}
if (score < 60)
printf("Grade is E!\n");
else if (score >= 60 && score < 70)
printf("Grade is D!\n");
else if (score >= 70 && score < 80)
printf("Grade is C!\n");
else if (score >=80 && score < 90)
printf("Grade is B!\n");
else
printf("Grade is A!\n");
return 0;
}