1.1在定义一个派生类时把派生方式指定为public的，称为公用继承，派生类称为公用派生类，基类称为公用派生类。

1.2关于公用继承的一段代码:

#include <iostream>

using namespace std;

class student

{

public:

    void display();

    void setValue(int number,int age,char* name);

private:

    int number;

    int age;

    char* name;

};

class student1:public student

{

public:

    void display_1(){display();cout << "sex is " << sex << endl;}

private:

    bool sex;

};

void student::setValue(int number,int age,char* name)

{

    this->number=number;

    this->age=age;

    this->name=name;

}

void student::display()

{

    cout << "number is " << number << endl;

    cout << "name is " << name << endl;

    cout << "age is " << age << endl;

}

int main()

{

    student1 stu;

    stu.setValue(1,18,"shukai");

    stu.display_1();

    return 0;

}

C++私有继承