#include<stdio.h>

main()

{

int a;

printf("请输入成绩：");

scanf("%d\n",&a);

switch(a/10)

{

case 10:

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("不及格\n");

break;

}

}