int?main()?{
int?array[20],?length,?i;
int?tmp,?sum?=?0,?average;
int?A?=?0,?B?=?0,?C?=?0,?D?=?0,?cnt?=?0;
for?(i?=?0;?;?++i)?{
scanf("%d",?&tmp);
if?(tmp?<?0)?{
break;
}
array[i]?=?tmp;
sum?+=?array[i];
if?(array[i]?>=?90)?{
++A;
}?else?if?(array[i]?>=?80)?{
++B;
}?else?if?(array[i]?>=?60)?{
++C;
}?else?{
++D;
}
}
length?=?i;
//(1)
putchar('\n');
printf("%d\n",?D);
//(2)
putchar('\n');
average?=?sum/length;
printf("%d\n",?average);
//(3)
putchar('\n');
for?(i?=?0;?i?<?length;?++i)?{
if?(array[i]?>=?average)?{
++cnt;
}
}
printf("%d\n",?cnt);
//(4)
putchar('\n');
printf("優秀：%d人，占%%%.2lf\n",?A,?1.0*A/length*100);
printf("良好：%d人，占%%%.2lf\n",?B,?1.0*B/length*100);
printf("壹般：%d人，占%%%.2lf\n",?C,?1.0*C/length*100);
printf("不及格：%d人，占%%%.2lf\n",?D,?1.0*D/length*100);
return?0;
}