person作为虚基类派生学生类和教师类

可以这样定义一个Person类作为虚基类：

class Person {
public:
    virtual void printInfo() const = 0;
    virtual ~Person() {}
};

然后我们可以分别派生出Student类和Teacher类，并实现各自的printInfo()函数：

class Student : virtual public Person {
private:
    std::string name;
    int age;
    std::string school;
public:
    Student(const std::string& name, int age, const std::string& school) 
        : name(name), age(age), school(school) {}

    void printInfo() const override {
        std::cout << "Name: " << name << ", Age: " << age << ", School: " << school << std::endl;
    }
};

class Teacher : virtual public Person {
private:
    std::string name;
    int age;
    std::string department;
public:
    Teacher(const std::string& name, int age, const std::string& department) 
        : name(name), age(age), department(department) {}

    void printInfo() const override {
        std::cout << "Name: " << name << ", Age: " << age << ", Department: " << department << std::endl;
    }
};

注意在派生类中，我们都使用了`virtual public Person`来继承Person类，这是为了避免在多重继承中产生二义性。同时我们也实现了纯虚函数`printInfo()`，这是因为Person类本身没有意义，只是作为一个基类存在，我们只需要让它的子类实现相应的函数即可。

这样，我们就可以使用以下代码来创建学生和教师对象并输出信息：

int main() {
    Person* p1 = new Student("Alice", 18, "MIT");
    Person* p2 = new Teacher("Bob", 35, "Computer Science");
    p1->printInfo();
    p2->printInfo();
    delete p1;
    delete p2;
    return 0;
}

输出为：

Name: Alice, Age: 18, School: MIT
Name: Bob, Age: 35, Department: Computer Science