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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: u6 M. `" i. @9 a
有無人知點解?& I) s4 V/ p3 ?# U4 `8 r
Server 的Backup Code?
5 o3 q$ y6 P0 U% K$ ^3 ^so funny, thanks a lot! ' S( n( O: L8 Q3 a: T u
2 D, S% `* N/ f好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
. d5 @6 v; `- d/ zMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
# D/ h) ], g, X- b9 ?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)' D4 @0 q- Z9 M @1 d( s3 `
e.g.
) Z% T. {/ t. H! [7 {9 j0 + 4294967295 = 4294967295 (max)
. j' {0 ?- `- ?+ O1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)
! `9 }* y$ _ z" D8 Xand so on....
- \+ ?. C6 d0 q+ P1 E/ y: W! e+ |# ~3 A
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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