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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:& o5 ]0 @* Y# N D* t! A
有無人知點解?8 o. J4 L; J$ |5 X0 v% M
Server 的Backup Code?
& n1 P( K9 R9 g3 }so funny, thanks a lot! ) J$ s9 t+ k! }4 I2 u
4 u! |# {4 M* w. }/ H& P- G. M
好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
: ~. U& K, }6 e ]" X7 X, Q+ fMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
0 R+ X1 q8 ^0 C6 s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)
: ]3 [4 f5 _' K% u# K( T' a/ re.g.
) x4 B S. y, K3 |3 ^4 H0 + 4294967295 = 4294967295 (max)( x) \2 X ]- F9 X
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)
( A* F8 k. I' c4 m0 u1 C. Gand so on....5 Z) z! _3 ~) x/ e$ B
- X( R @$ L. ]" d+ f% t/ o[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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