#include <iostream>

class A
{
    public:
    virtual void foo() {
        std::cout << "A::foo" << std::endl;
    }
    void bar() {
        std::cout << "A::bar" << std::endl;
    }
};

class B : public A
{
    public:
    void foo() override {
        std::cout << "B::foo" << std::endl;
    }
    void bar() {
        std::cout << "B::bar" << std::endl;
    }
};

int main() {
    A* a = new A();
    B* b = new B();
    A* c = b;

    a->foo();
    b->foo();
    c->foo();

    a->bar();
    b->bar();
    c->bar();

    return 0;
}