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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:
& P4 {8 J1 M5 Z2 w9 w" n9 f有無人知點解?5 {5 P( I, J/ u% b& I
Server 的Backup Code?
) \3 A- N3 }' f7 G' L4 n' M" Qso funny, thanks a lot! 0 J9 B5 O/ K# @0 b" j! S8 O& X/ n
. n: {0 q( W1 {+ r5 D9 |3 m
好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
( x# {7 v0 d/ H J4 ?3 _Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) ' \( O1 }& ~9 ]6 K2 _ c
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)' n5 X& y5 V; q/ P
e.g.
1 H5 C- D; s; ?0 + 4294967295 = 4294967295 (max)
/ E' ` G$ W6 l2 } x! }& R1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)
+ m% |$ ?$ ?: Fand so on....) f7 x6 j- w4 d" Z9 @: S3 t
, Y! I& p' F' u/ {$ ~/ K. q; t
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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