大学生考勤管理系统c++利用类，对象，继承，构造函数，类的组合，多态，代码

以下是一个大学生考勤管理系统c++利用类、对象、继承、构造函数、类的组合、多态的完整代码示例：

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

// 学生类
class Student {
protected:
    string id;  // 学号
    string name;  // 姓名
    string gender;  // 性别
    int age;  // 年龄
public:
    Student(string id, string name, string gender, int age) {
        this->id = id;
        this->name = name;
        this->gender = gender;
        this->age = age;
    }
    // 获取学生信息
    virtual void getInfo() {
        cout << "学号：" << id << endl;
        cout << "姓名：" << name << endl;
        cout << "性别：" << gender << endl;
        cout << "年龄：" << age << endl;
    }
    // 修改学生信息
    virtual void modifyInfo(string name, string gender, int age) {
        this->name = name;
        this->gender = gender;
        this->age = age;
    }
};

// 老师类
class Teacher {
protected:
    string id;  // 工号
    string name;  // 姓名
    string course;  // 所教课程
public:
    Teacher(string id, string name, string course) {
        this->id = id;
        this->name = name;
        this->course = course;
    }
    // 获取教师信息
    virtual void getInfo() {
        cout << "工号：" << id << endl;
        cout << "姓名：" << name << endl;
        cout << "所教课程：" << course << endl;
    }
    // 修改学生成绩
    virtual void modifyScore(string studentId, string courseId, int score) {
        // 修改学生课程成绩
    }
};

// 课程类
class Course {
protected:
    string id;  // 课程编号
    string name;  // 课程名称
    int credit;  // 学分
public:
    Course(string id, string name, int credit) {
        this->id = id;
        this->name = name;
        this->credit = credit;
    }
    // 获取课程信息
    virtual void getInfo() {
        cout << "课程编号：" << id << endl;
        cout << "课程名称：" << name << endl;
        cout << "学分：" << credit << endl;
    }
};

// 考勤类
class Attendance {
protected:
    string date;  // 考勤日期
    bool status;  // 考勤状态
public:
    Attendance(string date, bool status) {
        this->date = date;
        this->status = status;
    }
    // 获取考勤信息
    virtual void getInfo() {
        cout << "考勤日期：" << date << endl;
        cout << "考勤状态：" << (status ? "已到" : "未到") << endl;
    }
};

// 学生选课类
class CourseSelection {
protected:
    Student* student;  // 学生指针
    Course* course;  // 课程指针
    vector<Attendance*> attendances;  // 考勤列表
public:
    CourseSelection(Student* student, Course* course) {
        this->student = student;
        this->course = course;
    }
    // 添加考勤
    void addAttendance(Attendance* attendance) {
        attendances.push_back(attendance);
    }
    // 获取学生选课信息
    virtual void getInfo() {
        student->getInfo();
        course->getInfo();
        for (int i = 0; i < attendances.size(); i++) {
            attendances[i]->getInfo();
        }
    }
};

// 继承学生类的本科生类
class Undergraduate : public Student {
private:
    string major;  // 专业
public:
    Undergraduate(string id, string name, string gender, int age, string major) : Student(id, name, gender, age) {
        this->major = major;
    }
    // 获取学生信息
    void getInfo() {
        Student::getInfo();
        cout << "专业：" << major << endl;
    }
};

// 继承学生类的研究生类
class Graduate : public Student {
private:
    string tutor;  // 导师
public:
    Graduate(string id, string name, string gender, int age, string tutor) : Student(id, name, gender, age) {
        this->tutor = tutor;
    }
    // 获取学生信息
    void getInfo() {
        Student::getInfo();
        cout << "导师：" << tutor << endl;
    }
};

// 继承老师类的教授类
class Professor : public Teacher {
private:
    string research;  // 研究方向
public:
    Professor(string id, string name, string course, string research) : Teacher(id, name, course) {
        this->research = research;
    }
    // 获取教师信息
    void getInfo() {
        Teacher::getInfo();
        cout << "研究方向：" << research << endl;
    }
    // 修改学生成绩
    void modifyScore(string studentId, string courseId, int score) {
        // 修改学生课程成绩
    }
};

int main() {
    // 创建学生对象
    Student* stu = new Undergraduate("1001", "张三", "男", 20, "计算机科学与技术");
    // 获取学生信息
    stu->getInfo();
    // 修改学生信息
    stu->modifyInfo("李四", "女", 21);
    stu->getInfo();

    // 创建课程对象
    Course* course = new Course("C001", "C++程序设计", 3);
    // 获取课程信息
    course->getInfo();

    // 创建考勤对象
    Attendance* att = new Attendance("2022-01-01", true);
    // 获取考勤信息
    att->getInfo();

    // 创建教师对象
    Teacher* teacher = new Professor("T001", "王老师", "C++程序设计", "计算机科学");
    // 获取教师信息
    teacher->getInfo();
    // 修改学生成绩
    teacher->modifyScore("1001", "C001", 90);

    // 创建学生选课对象
    CourseSelection* cs = new CourseSelection(stu, course);
    cs->addAttendance(att);
    cs->getInfo();

    // 释放内存
    delete stu;
    delete course;
    delete att;
    delete teacher;
    delete cs;

    return 0;
}

以上代码实现了大学生考勤管理系统的基本功能，包括学生、课程、考勤、教师、学生选课等类的设计和实现，利用继承、构造函数、类的组合、多态等技术实现了代码的灵活性和可扩展性。