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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:
. {# a' \, }+ F& G) K% G有無人知點解?& s9 l% J7 w: [# W: w4 i
Server 的Backup Code?
9 q7 e7 h) X8 Q) G* Lso funny, thanks a lot! 1 S% n3 i ^! e) R* i
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好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
! |( M# |, I/ d+ L7 O# m) c+ aMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
1 `& M: R0 H" y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)7 |; n7 {: P& Y! y- G% _
e.g.& H: e% P! C' [% w
0 + 4294967295 = 4294967295 (max)
- f3 x! Z. O6 |: K# Z1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)4 D" q4 _: _, [6 x6 V8 g
and so on....
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1 g, f" Y- G$ f4 Q* f! ][ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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