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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:
5 ^4 |/ g3 _( g& i有無人知點解?5 E& u2 y; s- Z. _8 |9 s+ J
Server 的Backup Code?& f5 y7 E2 B5 X& S
so funny, thanks a lot! 7 ?) l# c; G2 G; L# Z$ Y; e
0 y* r% |7 L" p' e5 j1 T9 {( P6 U T好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面$ O1 h/ M9 n* h" H& P$ m, B
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) U% e' p& B. U- i% Z
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 R6 d0 O, I, P
e.g.
+ n4 b1 C5 ]* z* \7 e4 N4 i0 + 4294967295 = 4294967295 (max)' @, O4 {) q, I$ b8 }
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)8 Q9 L5 g1 }' v
and so on....
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[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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