百分制转换为五分制

int main()
{
int score,mark;
printf(“Please enter score:”);
scanf(“%d”,&score);
mark=score<0||score>100?-1:score/10;
switch(mark)
{
case 10:
case 9:printf(“%d–A\n”,score);
break;
case 8:printf(“%d–B\n”,score);
break;
case 7:printf(“%d–C\n”,score);
break;
case 6:printf(“%d–D\n”,score);
break;
case 5:
case 4:
case 3:
case 2:
case 1:
case 0:printf(“%d–E\n”,score);
break;
default:printf(“Input error!\n”);
}
}