        v a r   x   =   4 2 ; 
 
         v a r   y   =   " 4 2 " ; 
 
         i f   ( x   = =   y )   { 
 
                 a l e r t ( " x   b n g   y   q u a   p h  p   k i m   t h   n   g i n . " ) ; 
 
         }   e l s e   { 
 
                 a l e r t ( " x   k h  n g   b n g   y " ) ; 
 
         } 