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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:) d- Y0 D, e, Q
有無人知點解?9 Y1 b; y, w( n6 j
Server 的Backup Code?3 w7 s0 T0 o: ^" k# ~. m
so funny, thanks a lot! 8 T' U% {2 z7 e* t6 [* T
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好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面) u+ R( l3 H1 o
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
- N8 U( P6 C5 h. f2 m7 R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)2 u, g1 M$ l7 T' R/ d, A+ K
e.g.7 N' p- i+ x/ h1 f
0 + 4294967295 = 4294967295 (max)+ K& ~3 ?% I* u% k+ i
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow) w' I- H3 P2 f6 B
and so on....: ?/ f2 D8 a3 Z! k' J
/ ~ N: M3 k& P! w[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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