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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:; E" k$ o/ L7 J6 O
有無人知點解?: Y( [4 d: ^ U6 ?1 C7 L7 m- z
Server 的Backup Code?
( P. D1 s& t( C2 Vso funny, thanks a lot! ' S6 s5 S' m' B7 l* S9 M# `5 @' ~5 h, M, L' g \
好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面$ |( N* s3 }2 l" }
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
6 {$ I( `# C& u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)) w7 _, \# h f% o: N
e.g.
: d- o) H9 @/ v" w4 R4 l- D0 + 4294967295 = 4294967295 (max)
3 ]2 H$ i D! W Q) x1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)4 ]* A5 A: T( X. c
and so on....& @$ e- X/ }: f1 C& P
/ j j0 P( K) I3 V7 Q) t4 ^0 m" v: ~# g
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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