C++ 继承遇到同名成员变量和成员函数研究

#include 
using namespace std;



class Base {
public:
    int a, b;
};

class Derived : public Base {
public:
    int b, c;
};

void func() {
    Derived d;
    d.a = 1;
    d.Base::b = 2;
    d.b = 3;
    d.c = 4;
}

class A {
public:
    int a;
    int b;
    void printA() {
        cout << "父类：b is " << b << endl;
    }
    void print() {
        cout << "父类：b is " << b << endl;
    }
protected:
private:
};

class B : public A {
public:
    int b;
    int c;
    void printB() {
        cout << "子类：b is " << b << endl;
    }
    void print() {
        cout << "子类：b is " << b << endl;
    }
protected:
private:
};

void main() {

    B b1;
    b1.b = 10;
    b1.A::b = 11;
    b1.printA();
    b1.printB();

    cout << "main: b1.b is " << b1.b << " b1.A::b is " <<  b1.A::b << endl;

    b1.print();
    b1.B::print();

    b1.A::print();

    system("pause");
}