What is correct about the following program?

   #include 
   class Base 
   {
      int x, y, z;  
      public:  
      Base()    
      {        
          x = y = z = 0;   
      }
      Base(int xx, int yy = 'A', int zz = 'B')     
      {         
           x = xx;     
           y = x + yy;       
           z = x + y;  
    }   
    void Display(void) 
    {      
       cout" " " " class Derived : public Base 
 {    
     int x, y;   
     public:     
     Derived(int xx = 65, int yy = 66) : Base(xx, yy)    
     {        
           y = xx;        
           x = yy;     
    }
    void Display(void)     
    {       
          cout" " " ";   
          Display();    
    } 
 }; 
 int main() 
 {        Derived objD;    
          objD.Display();    
          return 0;  
 }