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發表於 2005-6-19 06:50 PM
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Originally posted by secretfj at 2005-6-19 06:37 PM:" x: h A' \; M9 P) X; R4 q
有無人知點解?
7 r4 `7 I* `+ k+ N }- A3 A0 d IServer 的Backup Code?
# n; _0 Y3 b! J k: g% rso funny, thanks a lot! 7 ]1 O0 ^ r/ S5 c3 K
+ R6 T6 i3 U( ^) w, m% P& n3 K- N好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面5 m( {# G/ _8 z
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
" t) q* }* V* {8 ^+ @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)
+ ]* s5 C: A3 h) g. }8 _e.g.
$ Z6 v0 a% W, u% W6 M) k4 U# Y0 + 4294967295 = 4294967295 (max)& p. J4 ], {! [" H
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)1 W$ D: u( u+ V Z* K
and so on....
. m3 Z! o- w% d" ]. @ w+ E S+ v9 o8 T: y
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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