Which of the following statement is correct about the program given

Which of the following statement is correct about the program given below?

#include 
 class Crackexams {     
   int x, y, z;    
   public:    
     Crackexams(int x = 100, int y = 30, int z = 0) {   
       this->x = x;          
       this->y = y;        
       this->z = z;        
       Display();    
     }     
     void Display() {     
       cout<< x << " " << y << " " << z;  
     }
 }; 
 int main() {
   int a = 0, b = 1, c = 2;  
   int &x = ++a;    
   int &y = --b;    
   int z = c + b - -c;   
   Crackexams objCrackexams(x, y, z);    
   return 0; 
 }

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