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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:' k8 x, Y& n) Y1 \8 G
有無人知點解?" _ A" L0 S2 i1 l& y" B! p; H9 A
Server 的Backup Code?3 T$ {4 F- t* `5 N( R/ F9 e2 ]* O7 R
so funny, thanks a lot! 6 G2 D0 c- C) u6 R
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好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面3 Q& E2 X+ p1 z8 K: U- Y
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
$ o `) m3 ~/ D- D9 R) N- W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)
8 h# x/ W. {; D$ I) M Be.g.
# x6 ~$ {0 n0 P) p0 + 4294967295 = 4294967295 (max)
# {- |2 }% C W& y y1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)
5 u( ], p! {) g# V7 U2 _# vand so on....7 `: F7 ^# ~8 Y6 A8 N( e
$ W1 H+ ^4 k# V7 X
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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