提高篇第22-25课第二题

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#include <stdio.h>#include <stdlib.h>#include <math.h>//第二题void input_score(int s[], int n); //将小组中n名同学的成绩输入数组sint get_max_score(int s[], int n);  //返回数组s中n名同学的最高成绩值int get_min_score(int s[], int n);  //返回数组s中n名同学的最低成绩值double get_avg_score(int s[], int n);  //返回数组s中n名同学的平均成绩值double get_stdev_score(int s[], int n); //返回数组s中n名同学成绩值的标准偏差int count(int x, int s[], int n);  //返回在数组s中n名同学中有多少人得x分（实参给出最高/低时，可以求最高/低成绩的人数）void output_index(int x, int s[], int n); //在函数中输出数组s中n名同学中得x分的学号（下标）int main(){int score[50]; //将score设为局部变量，通过数组名作函数参数，传递数组首地址，在函数中操作数组int num;       //小组人数也设为局部变量，将作为函数的实际参数int max_score, min_score;printf("小组共有多少名同学? ");scanf("%d", &num);printf("请输入学生成绩：\n");input_score(score, num);  //要求成绩在0-100之间max_score = get_max_score(score, num);printf("最高成绩为：%d，共有 %d 人\n", max_score, count(max_score, score, num));min_score = get_min_score(score, num);printf("最低成绩为：%d，共有 %d 人\n", min_score, count(min_score, score, num));printf("平均成绩为：%.2f\n", get_avg_score(score, num));printf("标准偏差为：%.2f\n", get_stdev_score(score, num));printf("获最高成绩的学生(学号)有：");output_index(max_score, score, num);printf("\n获最低成绩的学生(学号)有：");output_index(min_score, score, num);printf("\n");return 0;}void input_score(int s[], int n){int i;for (i = 0; i < n; i++)scanf("%d", s + i);}int get_max_score(int s[], int n){int max=s[0];int i;for (i = 0; i < n; i++){if (s[i] >= max)max = s[i];}return max;}int get_min_score(int s[], int n){int min = s[0];int i;for (i = 0; i < n; i++){if (s[i] <= min)min = s[i];}return min;}double get_avg_score(int s[], int n){int sum = 0;int i;double avg;for (i = 0; i < n; i++)sum += s[i];avg = sum / n;return avg;}double get_stdev_score(int s[], int n){int i;double avg;double temp_sum=0,stdev;avg = get_avg_score(s, n);for (i = 0; i < n; i++)temp_sum += (s[i] - avg)*(s[i] - avg);stdev = sqrt(temp_sum / (n - 1));return stdev;}int count(int key, int s[], int n){int count = 0,i;for (i = 0; i < n; i++)if (s[i] == key)count++;return count;}void output_index(int key, int s[], int n){int i;for (i = 0; i < n; i++)if (s[i] == key)printf("%d,", i);}
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