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3#
發表於 2005-6-19 06:50 PM
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Originally posted by secretfj at 2005-6-19 06:37 PM:
# d5 o1 T, X- w& T8 `( u+ Z0 }# H有無人知點解?
9 P+ A+ }: [2 L3 M. l/ C; ^Server 的Backup Code?
" _1 @( ^/ [8 [8 [& uso funny, thanks a lot! + [" Z, N4 O6 Z; C8 e/ r9 e
. ^' \2 O9 C2 @好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
; Y% u1 {4 q- A) f1 Y1 f2 K- g) S- |Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
$ n, ~" k6 Y& Q& K0 v* s6 B個 value 過左呢個 range 就會 overflow , 佢只會理最後個32bits 數 (即係好似返返轉頭 , 循環咁)
; H' g, y# g" j6 W! r ye.g.
( a, A- [4 ]4 J2 h' S0 + 4294967295 = 4294967295 (max)
2 B; {6 K' X2 J% C6 g3 H5 |1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow). ?5 S4 w9 b' F' ^
and so on....4 Y/ _' K0 m# }! S& c
# S! B- p$ s! G[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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