HDOJ  2004   成绩转换

题目：​​http://acm.hdu.edu.cn/showproblem.php?pid=2004​​

记得这是刚刚学习C++时候，学习while循环编的....

#include <stdio.h>
 int main(){
     int n, k;
     while(scanf("%d", &n) != EOF)
     {
         if(n < 0 || n >100)
             printf("Score is error!\n");
         else
         {
             k = n / 10;
             switch(k)
             {
             case 10: printf("A\n"); break;
             case 9: printf("A\n"); break;
             case 8: printf("B\n"); break;
             case 7: printf("C\n"); break;
             case 6: printf("D\n"); break;
             default: printf("E\n"); break;
             }
         }
     }
     return 0;
 }