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What will be the output of the following program?

  #include
  class Freshergate
  {   
      int x, y, z;   
      public:   
      void Apply(int xx = 12, int yy = 21, int zz = 9)       
      {     
          x = xx;   
          y = yy += 10;   
          z = x -= 2;    
     }   
     void Display(void) 
     {     
         cout" " void SetValue(int xx, int yy)  
     {       
        Apply(xx, 0, yy);   
     }
 };
 int main()
 {   
     Freshergate *pGate= new Freshergate;    
     (*pGate).SetValue(12, 20);  
      pGate->Display();   
      delete pGate;   
      return 0; 
 }