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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:% f; O" L |/ Q% v" ~
有無人知點解?
; r6 m$ q2 [. M! C5 e+ |4 X: L3 UServer 的Backup Code?# Z* T) B5 {' }
so funny, thanks a lot! / b5 g! V2 P, s# I6 ]8 E6 ]( _+ X, @) h
好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面1 d5 ^! T/ P7 H) @# D, \2 Y" ?
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) " u% C1 w e" _) H! _
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)
+ l$ ?, M# l$ m4 u# W! \e.g.$ X2 b: [$ ^) x3 [. }; a
0 + 4294967295 = 4294967295 (max)' f# v6 r2 d$ a& K8 }7 v
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)% D7 Z9 v! o f% a, b
and so on....7 J, G8 L- a6 q0 K4 y; K
1 D* E& n* s0 X[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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