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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:# j" ?/ V2 @0 |2 w# ?! D1 r
有無人知點解?! g- k( G+ T, j% l+ {4 \" A) v6 \
Server 的Backup Code? h k. \; J6 R7 Y0 C# m6 N; B: `
so funny, thanks a lot! 2 Q9 b; r5 r* V Y
( j* K; ?+ k* X. t$ f) Z好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
- p# C) B1 y% v, k0 R8 jMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
9 e1 H9 D7 R' f, n" K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)
; S: z/ v0 i- ~3 c8 }) i- \$ {) Te.g.6 |3 t# M- N, ?# v) }2 ^" E4 B
0 + 4294967295 = 4294967295 (max)5 i9 ^- g2 L. `5 Y/ {
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)) c$ l: t" ]3 T; T4 W& [
and so on....5 @9 ]: T4 I* o& o. G+ M
; c4 k) T5 r- S3 O( a[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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