main()                                                           
   {
       int   x, y;                                                  
       int   *ptr;                                                  
       x = 10;                                                      
       ptr = &x;                                                    
       y = *ptr;                                                    
       printf("Value of x is %d\n\n",x);                            
       printf("%d is stored at addr %u\n", x, &x);                  
       printf("%d is stored at addr %u\n", *&x, &x);                
       printf("%d is stored at addr %u\n", *ptr, ptr);              
       printf("%d is stored at addr %u\n", y, &*ptr);               
       printf("%d is stored at addr %u\n", ptr, &ptr);              
       printf("%d is stored at addr %u\n", y, &y);                  
       *ptr = 25;                                                   
       printf("\nNow x = %d\n",x);                                  
                                                                    
   }                                                                
Output                                                           
   Value of x is 10                                                 
   10     is stored at addr 4104                                        
   10     is stored at addr 4104                                        
   10     is stored at addr 4104                                        
   10     is stored at addr 4104                                        
   4104 is stored at addr 4106                                      
   10     is stored at addr 4108                                        
  Now x = 25