C++ Programming - Objects and Classes - Discussion

#include<iostream.h> 
class BixBase
{
    int x, y; 
    public:
    BixBase(int xx = 10, int yy = 10)
    {
        x = xx;
        y = yy;
    }
    void Show()
    {
        cout<< x * y << endl;
    }
};
class BixDerived
{
    private:
        BixBase objBase; 
    public:
    BixDerived(int xx, int yy) : objBase(xx, yy)
    {
        objBase.Show();
    }
};
int main()
{
    BixDerived objDev(10, 20);
    return 0; 
}