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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:
$ c/ r3 P3 h y6 U2 e$ _有無人知點解?/ `0 {7 h( X3 J Z: W' ]
Server 的Backup Code?
. O7 K, @2 u" _5 `$ _so funny, thanks a lot! % h/ J P* Y" a
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好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
* X$ m# I& d+ F5 \# cMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) " x3 u9 o0 o# S& v. }5 I
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 ^7 W) F4 O2 Y) ]- ]! U% A# T# Re.g.+ M1 H* d/ f: d! w6 E
0 + 4294967295 = 4294967295 (max)3 y8 V7 C( p, Z* F
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow); m2 b' g `+ D
and so on....
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4 r& s# C) o3 n8 i, Q# X7 V" @, D0 L$ i[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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