假设要管理下述几类人员的如下一些数据。 teacher(教师)类:姓名、性别、年龄、职称、担任 课程; student(学生)类:姓名、性别、年龄、学号、系别; gradstudent(研究生)类:姓名、性别、年龄、学号、系别、导师。 要求每个类只设立构造函数以及显示类对象数据的成员函数（可为虚函数）。编写主函数，说明有关类对象，并对其类成员函数进行简单使用（如果使用了虚函数，在主函数中利用基类指针指向派生类，结合虚函数实现多态）。

好的，我可以帮你编写这个程序。下面是所需的三个类的代码实现：

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

// 基类Person
class Person {
protected:
    string name;
    char gender;
    int age;
public:
    Person(string name, char gender, int age) : name(name), gender(gender), age(age) {}
    virtual void display() {
        cout << "Name: " << name << endl;
        cout << "Gender: " << gender << endl;
        cout << "Age: " << age << endl;
    }
};

// 教师类Teacher
class Teacher : public Person {
private:
    string title;
    string course;
public:
    Teacher(string name, char gender, int age, string title, string course) : Person(name, gender, age), title(title), course(course) {}
    void display() {
        cout << "Teacher:" << endl;
        Person::display();
        cout << "Title: " << title << endl;
        cout << "Course: " << course << endl;
    }
};

// 学生类Student
class Student : public Person {
private:
    string id;
    string department;
public:
    Student(string name, char gender, int age, string id, string department) : Person(name, gender, age), id(id), department(department) {}
    void display() {
        cout << "Student:" << endl;
        Person::display();
        cout << "ID: " << id << endl;
        cout << "Department: " << department << endl;
    }
};

// 研究生类GradStudent
class GradStudent : public Student {
private:
    string tutor;
public:
    GradStudent(string name, char gender, int age, string id, string department, string tutor) : Student(name, gender, age, id, department), tutor(tutor) {}
    void display() {
        cout << "Graduate Student:" << endl;
        Student::display();
        cout << "Tutor: " << tutor << endl;
    }
};

// 主函数
int main() {
    Person* people[3];
    people[0] = new Teacher("Tom", 'M', 35, "Associate Professor", "Computer Science");
    people[1] = new Student("Lucy", 'F', 20, "20191001", "Computer Science");
    people[2] = new GradStudent("Jack", 'M', 25, "20202001", "Computer Science", "Mary");

    for (int i = 0; i < 3; i++) {
        people[i]->display();
        cout << endl;
    }

    for (int i = 0; i < 3; i++) {
        delete people[i];
    }

    return 0;
}

这个程序定义了三个类：`Person`、`Teacher`、`Student`和`GradStudent`，分别表示人员、教师、学生和研究生。每个类都只设立构造函数以及显示类对象数据的成员函数，并使用了虚函数实现多态。在主函数中，定义了一个基类指针数组，分别指向三个派生类的对象，并分别调用了它们的 `display()` 函数，实现了多态效果。