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之前提到过两个继承与派生的例题，我们从更简单的那个入手，利用虚基类优化后的代码如下：
点我跳到继承与派生习题讲解
#include<iostream>
#include<iomanip>
#include<string>
using namespace std;
class person {
protected:string name;int age;char gender;string address;string phone;
};
class teacher:virtual public person {//教师类（基类）
protected:string title;//职称
public:teacher(const string na,const int age,const char gender, const string address,const string phone,const string title) {this->name = na;this->age = age;this->gender = gender;this->address = address;this->phone = phone;this->title = title;}void display();
};
class cadre:virtual public person {//干部类（基类）
protected:string post;//职务public:cadre(string name, int age, char gender, string address, string phone, string post) {this->name = name;this->age = age;this->gender = gender;this->address = address;this->phone = phone;this->post = post;}void display();
};
class teacher_cadre :public teacher, public cadre,virtual public person {//教师干部类（派生类）
private:double wages;//工资
public:teacher_cadre(string name, int age, char gender, string address, string phone, string title, string post, double wages):teacher(name,age,gender,address,phone,title) ,cadre(name, age, gender, address, phone, post)//成员表部分{this->wages = wages;}void show();
};void teacher::display() {cout << setw(10) << "姓名：" << this->name << endl;//输出优化cout << setw(10) << "年龄：" << this->age << endl;cout << setw(10) << "性别：" << this->gender << endl;cout << setw(10) << "地址：" << this->address << endl;cout << setw(10) << "电话：" << this->phone << endl;cout << setw(10) << "职称：" << this->title << endl;
}void cadre::display() {cout << setw(10) << "姓名：" << this->name << endl;cout << setw(10) << "年龄：" << this->age << endl;cout << setw(10) << "性别：" << this->gender << endl;cout << setw(10) << "地址：" << this->address << endl;cout << setw(10) << "电话：" << this->phone << endl;cout << setw(10) << "职务：" << this->post << endl;
}void teacher_cadre::show() {teacher::display();cout << setw(10) << "职务：" << cadre::post << endl;cout << setw(10) << "工资：" << wages << endl;
}int main() {teacher t("sgq", 18, 'f', "华南师范大学", "18249096680", "正高级教授");cadre c("yjb", 18, 'm', "计算机学院", "13936090789", "sgq的助教");teacher_cadre tc("lyq", 19, 'f', "哲学与社会发展学院", "15813624032, "高级教授", "校长", 5201314);t.display();cout << endl;c.display();cout << endl;tc.show();
}
上述代码增加了一个基类Person类，包含了教授和职工都具有的数据，之后更改其派生的语句，在继承方式前加上关键字“virtual”即可减少运行的冗余，运行结果不变。
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