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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:
4 K: h/ W3 m) Z有無人知點解?
8 b& ^" O( W9 Q) Q2 UServer 的Backup Code?
\% x: ?- f- R) [) ?" k6 Yso funny, thanks a lot! ; j: O9 H' ?' B. {5 D W( \
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好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面$ K d& _/ U3 E0 M% [
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) 8 W, G+ K: q! h8 o
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)
% o, w" T, a! |e.g.
1 k8 N& [6 _8 a0 + 4294967295 = 4294967295 (max)
3 Y% N1 D& [# N5 T1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)9 W+ J7 S2 f% Q- q3 @# y
and so on....5 C/ {, y. }5 q
7 C5 K3 g( H" _& N0 a* A4 z
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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