int a =
;
int b =
;
(1)
n = a*
b++
;
n = a*b;
b++
;
(2)
n = a*
b--
;
n = a*b;
b--
;
(3)
n = a*
++b
;
b++
; n = a*b;
(4)
n = a*
--b
;
b--
; n = a*b;