class parent
{
public:
    virtual void foo()
    {
        cout << "my foo parent" << endl;
    }
    void fool()
    {
        cout << "my fool parent" << endl;
    }
};

class son :public parent
{
    void foo()
    {
        cout << "my foo son" << endl;
    }
    void fool()
    {
        cout << "my fool son" << endl;
    }
};

    parent* p = new son;
    p->foo();
    p->fool();

my foo son
my fool parent