怎么用C++写这个啊？

定义一个student类，在该类定义中包括：一个数据成员（分数score）及两个静态数据成员（总分total和学生人数count）；成员函数scoretotalcount(double s) 用于设置分数、求总分和累计学生人数；静态成员函数sum()用于返回总分；静态成员函数average()用于求平均值。

在main函数中，输入某班同学的成绩，并调用上述函数求全班学生的总分和平均分。

#include<iostream>
using namespace std;

class Student
{
public:
    Student(string);
    static float total;
    static int count;//定义静态数据成员
    void scoretotalcount(float s);
    static float sum();
    static float average();//定义静态成员函数
private:
    string name;
    float score;
};

int Student::count = 0;
float Student::total = 0;

Student::Student(string name)
{
    this->name = name;
    count++;    
}//录入学生姓名

void Student::scoretotalcount(float s)
{
    score = s;
    total += s;
}//录入学生成绩并随录入计算总分

float Student::sum()
{
    return total;
}//返回全班总分

float Student::average()
{
    return total / count;
}//返回全班平均分

int main()
{
    Student student1("xiaowang");
    student1.scoretotalcount(90.5);
    Student student2("xiaoming");
    student2.scoretotalcount(93.5);

    cout << "全班总分为：" << Student::sum() << endl;
    cout << "全班平均分为：" << Student::average() << endl;

    return 0;
}

#include <iostream>
#include <vector>
using namespace std;

class Student
{
public:
    Student() { ++m_count; }
    ~Student() {}

    void setScore(double s) { m_score = s; m_total += s; }

//     double score(void) { return m_score; }
//     int count(void) { return m_count; }
    static double sum(void) { return m_total; }
    static double average(void) { return m_count == 0 ? 0.0f : m_total / m_count; }

public:
    static double m_total;
    static int m_count;

private:
    double m_score = 0;
};
double Student::m_total = 0.0f;
int Student::m_count = 0;


int main()
{
    std::vector<Student*> students;
    while (true)
    {
        cout << "输入大于等于0的数为学生分数；\n输入小于0的数结束输入并统计\n";
        cout << "请输入学生分数：";
        double score = 0.0f;
        cin >> score;
        if (score < 0)
        {
            break;
        }
        else
        {
            auto stu = new Student;
            stu->setScore(score);
            students.push_back(stu);
        }
    }
    cout << "总分：" << Student::sum() << endl;
    cout << "平均分：" << Student::average() << endl;


    system("pause");
}