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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:3 U+ g" E% q% n: h' q; @$ S' ^, g! f
有無人知點解?
% y# k/ x/ Z4 @" \Server 的Backup Code?
2 ^: R+ F: g* g* j6 Yso funny, thanks a lot! - z6 s8 ~+ w+ L' m
& b! c+ u x4 J+ V好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
: m% v1 ~) R% A" dMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) . l u9 S/ K: m7 X# w/ [* p& s
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)" W, q; q; V9 q. `+ Q: C
e.g.
6 p: ~9 m$ C3 q" Z- `+ z0 + 4294967295 = 4294967295 (max)9 }2 H6 m1 D( M' K
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)5 s5 y) ^; x E9 [, Z- H; p1 O
and so on....
0 P! N% K/ P; z# W3 g! E+ `: a4 [( m4 I' i
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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