用c++类的组合技术，设计一个基本信息类、一个学生类、一个教师类。基本信息类包括姓名、性别、手机号、班级；学生类包括姓名、性别、手机号、班级、数学、语文和英语等成绩；教师类包括姓名、性别、手机号、班级、专业、教龄等。以上三个类必须包含构造函数，其他成员函数自行设计。主函数中，分别生成一个学生类和教师类对象，并调用成员函数。并分析

首先我们可以使用组合技术，将基本信息类作为学生类和教师类的成员变量。这样可以避免在学生类和教师类中重复定义姓名、性别、手机号和班级等基本信息。

以下是一个基本信息类的实现：

class BasicInfo {
public:
    BasicInfo(const string& name, const string& gender, const string& phone, const string& cls)
        : name_(name), gender_(gender), phone_(phone), cls_(cls) {}
    string getName() const { return name_; }
    string getGender() const { return gender_; }
    string getPhone() const { return phone_; }
    string getCls() const { return cls_; }
private:
    string name_;
    string gender_;
    string phone_;
    string cls_;
};

接下来是学生类的实现：

class Student {
public:
    Student(const string& name, const string& gender, const string& phone, const string& cls,
            double math, double chinese, double english)
        : basicInfo_(name, gender, phone, cls), math_(math), chinese_(chinese), english_(english) {}
    double getMath() const { return math_; }
    double getChinese() const { return chinese_; }
    double getEnglish() const { return english_; }
    double getAverage() const { return (math_ + chinese_ + english_) / 3; }
    void printInfo() const {
        cout << "Name: " << basicInfo_.getName() << endl;
        cout << "Gender: " << basicInfo_.getGender() << endl;
        cout << "Phone: " << basicInfo_.getPhone() << endl;
        cout << "Class: " << basicInfo_.getCls() << endl;
        cout << "Math: " << math_ << endl;
        cout << "Chinese: " << chinese_ << endl;
        cout << "English: " << english_ << endl;
        cout << "Average: " << getAverage() << endl;
    }
private:
    BasicInfo basicInfo_;
    double math_;
    double chinese_;
    double english_;
};

最后是教师类的实现：

class Teacher {
public:
    Teacher(const string& name, const string& gender, const string& phone, const string& cls,
            const string& major, int years)
        : basicInfo_(name, gender, phone, cls), major_(major), years_(years) {}
    string getMajor() const { return major_; }
    int getYears() const { return years_; }
    void printInfo() const {
        cout << "Name: " << basicInfo_.getName() << endl;
        cout << "Gender: " << basicInfo_.getGender() << endl;
        cout << "Phone: " << basicInfo_.getPhone() << endl;
        cout << "Class: " << basicInfo_.getCls() << endl;
        cout << "Major: " << major_ << endl;
        cout << "Years: " << years_ << endl;
    }
private:
    BasicInfo basicInfo_;
    string major_;
    int years_;
};

在主函数中，我们可以分别生成一个学生类和教师类对象，并调用成员函数进行输出：

int main() {
    Student s("Tom", "Male", "123456789", "Grade 1, Class 1", 80, 90, 85);
    s.printInfo();

    Teacher t("Lucy", "Female", "987654321", "Grade 1, Class 2", "Math", 3);
    t.printInfo();

    return 0;
}

输出结果如下：

Name: Tom
Gender: Male
Phone: 123456789
Class: Grade 1, Class 1
Math: 80
Chinese: 90
English: 85
Average: 85
Name: Lucy
Gender: Female
Phone: 987654321
Class: Grade 1, Class 2
Major: Math
Years: 3

从输出结果可以看出，我们成功地使用了组合技术，将基本信息类作为学生类和教师类的成员变量，避免了重复定义基本信息。同时，我们也成功地实现了构造函数和其他成员函数，并在主函数中调用了这些函数，输出了学生和教师的基本信息和成绩或教龄等信息。