What will be the output of the following program?

#include<iostream.h> 
struct CuriousTab
{
    int arr[5]; 
    public:
    void CuriousTabFunction(void);
    void Display(void);
};
void CuriousTab::Display(void)
{
    for(int i = 0; i < 5; i++) 
        cout<< arr[i] << " " ;
}
void CuriousTab::CuriousTabFunction(void)
{
    static int i = 0, j = 4; 
    int tmp = arr[i]; 
    arr[i]  = arr[j]; 
    arr[j]  = tmp   ; 
    i++;
    j--;
    if(j != i) CuriousTabFunction();
}
int main()
{
    CuriousTab objCuriousTab = {{ 5, 6, 3, 9, 0 }};
    objCuriousTab.CuriousTabFunction();
    objCuriousTab.Display();
    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;
}