求解答这道c++的 题 谢谢大家了

2. 创建工程Test2，新建teacher.h文件和teacher.cpp文件。具体要求如下：定义学生类，其中至少包括姓名、性别、学号和成绩。实现如下功能：

（1）姓名、性别、学号、成绩的初始化采用有参构造函数和无参构造函数2类方法。

（2）输入所有同学的成绩；

（3）求不及格的人数；

（4）求该所有同学成绩的平均分；

```c++
#ifndef TEACHER_H
#define TEACHER_H

#include <iostream>
#include <string>
#include <vector>

using namespace std;

class Student {
public:
    Student();
    Student(string name, string gender, string id, float score);

    void inputScores();
    int countFailed();
    float getAverageScore();

private:
    string name;
    string gender;
    string id;
    float score;
    vector<float> scores;
};

#endif

#include "teacher.h"

Student::Student() {}

Student::Student(string name, string gender, string id, float score) {
    this->name = name;
    this->gender = gender;
    this->id = id;
    this->score = score;
}

void Student::inputScores() {
    int n;
    cout << "请输入学生人数: ";
    cin >> n;

    for (int i = 0; i < n; i++) {
        float score;
        cout << "请输入第" << i + 1 << "个学生的成绩: ";
        cin >> score;
        scores.push_back(score);
    }
}

int Student::countFailed() {
    int cnt = 0;
    for (float score : scores) {
        if (score < 60) {
            cnt++;
        }
    }
    return cnt;
}

float Student::getAverageScore() {
    float sum = score;
    for (float s : scores) {
        sum += s;
    }
    return sum / (scores.size() + 1);
}

#include "teacher.h"

int main() {
    Student stu("张三", "男", "1001", 90);
    stu.inputScores();
    cout << "不及格的人数：" << stu.countFailed() << endl;
    cout << "平均分：" << stu.getAverageScore() << endl;

    return 0;
}


```c++