如何利用C++实现一个简单的学生考试成绩分析程序？

struct Student
{
    string name;  // 学生姓名
    int chinese;  // 语文成绩
    int math;     // 数学成绩
    int english;  // 英语成绩
    int total;    // 总成绩
};

void inputStudent(Student &stu){   //输入学生信息
    cin >> stu.name >> stu.chinese >> stu.math >> stu.english;
    stu.total = stu.chinese + stu.math + stu.english;
}

void outputStudent(const Student &stu){ //输出学生信息
    cout << stu.name << "    " << stu.chinese << "    " << stu.math << "    "
         << stu.english << "    " << stu.total <<endl;   //输出每个学生的信息
}

int calcTotalScore(const Student &stu){   //计算总分
    return stu.chinese + stu.math + stu.english;
}

double calcAverageScore(const Student &stu){  //计算平均分
    return (stu.chinese + stu.math + stu.english) / 3.0;
}

int getMaxScore(const vector<Student> &students){   //获取最高分
    int max_score = 0;
    for(int i = 0; i < students.size(); i++){
        if(students[i].total > max_score)
            max_score = students[i].total;
    }
    return max_score;
}

int getMinScore(const vector<Student> &students){   //获取最低分
    int min_score = 100;
    for(int i = 0; i < students.size(); i++){
        if(students[i].total < min_score)
            min_score = students[i].total;
    }
    return min_score;
}

bool cmpTotalScore(const Student &stu1, const Student &stu2){    //按总分排序
    return stu1.total > stu2.total;
}

bool cmpChineseScore(const Student &stu1, const Student &stu2){  //按语文成绩排序
    return stu1.chinese > stu2.chinese;
}

bool cmpMathScore(const Student &stu1, const Student &stu2){     //按数学成绩排序
    return stu1.math > stu2.math;
}

bool cmpEnglishScore(const Student &stu1, const Student &stu2){  //按英语成绩排序
    return stu1.english > stu2.english;
}

void searchStudent(vector<Student> &students){   //查询学生成绩
    int cmd; //查询方式

    cout << "请选择查询方式：1. 按姓名查询；2. 按总分查询" << endl;
    cin >> cmd;
    switch (cmd) {
        case 1:   //按姓名查询
            {
                string name;
                cout << "请输入学生姓名：" << endl;
                cin >> name;
                for(int i = 0; i < students.size(); i++)
                {
                    if(students[i].name == name)
                        outputStudent(students[i]);
                }
            }
            break;
        case 2:   //按总分查询
            {
                int min_score, max_score;
                cout << "请输入查询范围：" << endl;
                cin >> min_score >> max_score;
                for(int i = 0; i < students.size(); i++)
                {
                    if(students[i].total >= min_score && students[i].total <= max_score)
                        outputStudent(students[i]);
                }
            }
            break;
        default:
            cout << "输入错误，请重新输入！" << endl;
            break;
    }
}