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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:: V: b; S& ^) q/ M2 E; k* H
有無人知點解?% c7 z7 Q, L5 X4 I4 X
Server 的Backup Code?
# O" X7 n% Y2 U9 A& u- S! L0 ~0 y7 M% Jso funny, thanks a lot! : b" n5 q# Y/ J2 O. h$ _+ W4 `, N l
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好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面. L1 @/ T" w' w
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) 4 U; }! @. L$ t% a( ~
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)
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0 + 4294967295 = 4294967295 (max)
' Y$ E9 r/ w) e6 _; J) H/ A' h1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow): \9 R) P5 o" ^" W# X' v2 M! z
and so on...., f- W; z( n2 \3 e/ ?, o9 f
- [& h3 Z5 D% N- u0 K% R[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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