第十三周项目3-成绩处理函数版

/** Copyright (c) 2014, 烟台大学计算机学院* All rights reserved.* 文件名称：test.cpp* 作    者：冷基栋* 完成日期：2014 年 11  月  23  日* 版 本 号：v1.0* 问题描述： 成绩统计的功能函数*/#include <iostream>#include <cmath>using namespace std;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(void){    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;    cout<<"小组共有多少名同学?";    cin>>num;    cout<<endl<<"请输入学生成绩："<<endl;    input_score(score, num);  //要求成绩在0-100之间    max_score=get_max_score(score, num);    cout<<endl<<"最高成绩为："<<max_score<<"，共有 "<<count(max_score, score, num )<<" 人。";    min_score=get_min_score(score, num);    cout<<endl<<"最低成绩为："<<min_score<<"，共有 "<<count(min_score,score, num )<<" 人。";    cout<<endl<<"平均成绩为："<<get_avg_score(score, num);    cout<<endl<<"标准偏差为："<<get_stdev_score(score, num);    cout<<endl<<"获最高成绩的学生(学号)有：";    output_index(max_score,score, num);    cout<<endl<<"获最低成绩的学生(学号)有：";    output_index(min_score,score, num);    cout<<endl;    return 0;}void input_score(int s[], int n){    int i=1;    while (i<=n)    {        cout<<"第"<<i<<"名同学的成绩是：";        cin>>s[i];        if (s[i]>=0&&s[i]<=100)            i++;        else            cout<<"输入成绩错误";        continue;        cout<<s[i]<<endl;    }}int get_max_score(int s[], int n){    int i,high=0;    for (i=1; i<=n; i++)    {        if (high<s[i])            high=s[i];    }    return high;}int get_min_score(int s[], int n){    int i,low=0;    for (i=1; i<=n; i++)    {        if (low>s[i])            low=s[i];    }    return low;}double get_avg_score(int s[], int n){    int i,sum=0;    double avg;    for (i=1; i<=n; i++)    {        sum+=s[i];        avg=sum/i;    }    return avg;}double get_stdev_score(int s[], int n){    double a,c=0,b,sum=0,avg;    int i=1;    for (i=1; i<=n; i++)    {        sum+=s[i];        avg=sum/i;    }    for (i=1; i<=n; i++)    {        a=s[i]-avg;        c+=a*a;        b=sqrt(c/(n-1));    }    return b;}int count(int x, int s[], int n){    int i=1,a=0;    for (; i<=n; i++)    {        if(x==s[i])            a++;    }    return a;}void output_index(int x, int s[], int n){    int i=1;    for (; i<=n; i++)    {        if (s[i]==x)            cout<<i;    }}