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#include
main()
{
int score, grade;
printf("Input a score(0~100): ");
scanf("%d", &score);
grade = score/10; /*将成绩整除10，转化成switch语句中的case标号*/
switch (grade)
{
case 10:
case 9: printf("grade=A\n"); break; /*标号10和9，都执行本行的2条语句*/
case 8: printf("grade=B\n"); break;
case 7: printf("grade=C\n"); break;
case 6: printf("grade=D\n"); break;
case 5:
case 4:
case 3:
case 2:
case 1:
case 0:
printf("grade=E\n"); break; /*标号5、4、3、2、1和0，都执行本行的2条语句 */
default: printf("The score is out of range!\n"); /*成绩超出范围时，提示出错*/
}
}
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