提高篇16-19第二題

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
//第二題
void calcu(int);//處理和分數相關的功能
int main()
{
	int num;        //小組人數
	printf("小組共有多少名同學?");
	scanf("%d", &num);
	if (num >= 50)
	{
		printf("輸入人超過50，輸入錯誤");
		exit(0);
	}
	else
		calcu(num);
		return 0;
}
void calcu(int num)//輸入num名同學的成績
{
	double std_dev = 0, ave, temp_sum = 0;//標準差
	int count_max = 0, count_min = 0,sum=0;
	int max_score[50], min_score[50];
	int score[50]; //保存成績的數組，不會超過50名
	int i,temp_score;
	int max, min;
	printf("請輸入學生成績：\n");
	for (i = 0; i < num; i++)
	{
		printf("請輸入第%d名學生的成績:", i + 1);
		scanf("%d", &temp_score);
		if (temp_score >= 0 && temp_score <= 100)
			score[i] = temp_score;
		else
		{
			printf("分數輸入範圍錯誤，請重新輸入\n");
			i--;
		}
	}
	max = score[0];
	min = score[0];
	for (i = 0; i < num; i++)
	{
		sum += score[i];
		if (score[i] >= max)
			max = score[i];
		if (score[i] <= min)
			min = score[i];
	}
	ave = sum / num;
	printf("最高成績爲%d,最低成績爲%d,平均成績爲%.1lf\n",max,min,ave);
	for (i = 0; i < num; i++)
	{
		if (score[i] == max)
		{
			max_score[count_max] = i;
			count_max++;
		}
		if (score[i] == min)
		{
			min_score[count_min] = i;
			count_min++;
		}
	}
	printf("取得最高分%d分共%d人,他們的學號是：", max, count_max);
	for (i = 0; i < count_max; i++)
		printf("%d ", max_score[i]+1);
	printf("\n");
	printf("取得最低分%d分共%d人,他們的學號是：", min, count_min);
	for (i = 0; i < count_min; i++)
		printf("%d ", min_score[i]+1);
	printf("\n");
	for (i = 0; i < num; i++)
	{
		temp_sum += (score[i] - ave)*(score[i] - ave);
	}
	temp_sum /= num - 1;
	std_dev = sqrt(temp_sum);
	printf("標準偏差爲%.3lf\n", std_dev);
}