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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' r8 ~! X8 J3 ?: @" w$ _有無人知點解?. p7 [7 B2 }. s$ s
Server 的Backup Code?
T) S( q. x) R+ U) q% kso funny, thanks a lot! C, k2 B# i- x; \9 G
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好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面* W7 R4 y* t! ]$ ?# F# I
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
! I* S1 b. u7 z! N p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)
4 l4 U0 ?5 `% Ze.g.
9 D- f, z# E7 k: r: p p9 W0 + 4294967295 = 4294967295 (max)
. R: s* T6 E+ H% Z H1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)5 O/ Y9 ^, T( g% y/ E
and so on....
- G7 O) N! A+ k/ p# `7 a) K' L8 {1 J- k& \* u& o& t
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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