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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:' P2 |* S" v( Q2 h4 [6 @* J2 G2 L
有無人知點解?$ U# M9 m2 _" n% r5 T/ x
Server 的Backup Code?
1 w z8 Y9 J, E& ~" ~! A5 b0 {6 xso funny, thanks a lot! " n/ L- {% N e5 Y' F
9 [3 t$ R% A) O3 t' x. i好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面& H) w' f+ Z1 z
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
5 }% h: @; W" K8 a2 }' L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)
( t8 h, w2 h/ z, M8 G1 M$ Se.g.
8 Z) t% e: g. j8 \' U* i1 g. H0 + 4294967295 = 4294967295 (max)1 J/ G/ x( T2 N4 v8 ~
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)& n. Q6 A0 c* Q0 C) U2 G
and so on....+ q b6 T( G$ u
" a3 x6 v% m- f' k! ^
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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