[C] 주소연산자(&)와 포인터연산자(*)

수식              형               동일한 표현

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&X                int*              
*&X               int              X
&*&X              int*             &X
*ptr              int
&*ptr             int*             ptr
*pptr             int*            
**pptr            int              
&**pptr            int*             *pptr