What will be the output of the following program?

#include<iostream.h> 
class CuriousTab
{
    int Num; 
    public:
    CuriousTab(int x)
    {
        Num = x;
    }
    int CuriousTabFunction(void);
};
int CuriousTab::CuriousTabFunction(void)
{
    static int Sum = 0; 
    int Dec;
    Dec = Num % 10; 
    Num = Num / 10; 
    if((Num / 100)) CuriousTabFunction(); 
    Sum  = Sum * 10 + Dec; 
    return Sum;
}
int main()
{
    CuriousTab objCuriousTab(12345);
    cout<< objCuriousTab.CuriousTabFunction();
    return 0; 
}

#include<iostream.h> 
class CuriousTab
{
    int x, y; 
    public:
    CuriousTab(int xx = 10, int yy = 20 )
    {
        x = xx; 
        y = yy;
    }
    void Display()
    {
        cout<< x << " " << y << endl;
    } 
    ~CuriousTab()
    { } 
};
int main()
{
    CuriousTab objCuriousTab; 
    objCuriousTab.Display(); 
    return 0;
}

1. Once a reference variable has been defined to refer to a particular variable it can refer to any other variable.
2. A reference is not a constant pointer.

class Birds {};
class Peacock : protected Birds {};

#include<iostream.h> 
int main()
{
    int x = 80; 
    int &y = x;
    x++;
    cout << x << " " << --y;
    return 0;
}