class parent {

public:

    void f() { cout << "parent f()" << endl; }

    void f(int i) { cout << "parent f(int i)" << endl; }

};

class child :public parent {

};

int main() {

    child a;

    a.f();

    a.f();

    return ;

}

class child2 :public parent {

public:

    void f() {

        cout << "child f()" << endl;

    }

};

int main() {

    child2 a;

    parent *p = &a;

    child2 *c = &a;

    a.f();                //child f()

    a.parent::f();        //parent f()

    a.parent::f();        //parent f(2)

    p->f();                // parent f()

    p->f();            //    parent f(2)

    c->f();                //  child f()

    //    c->f(2);        illegal

    return ;

}