G - 成绩转换

#include<stdio.h>
int main()
{
  int grade;
  while(scanf("%d",&grade) != EOF)
  {
    if(grade>100 || grade<0)
    {
    printf("Score is error!\n");
    continue;
    }
    switch(grade/10)
    {
      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;
}