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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:
* N) ]% M Y7 d) O% q# I8 m( |有無人知點解?
% d' q5 L# @; U/ E! zServer 的Backup Code?
' b, }$ X3 @3 s( {1 q9 tso funny, thanks a lot! % X, M( G& B- F/ Z1 i8 j0 e0 S0 z1 }$ ?
好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
# t6 a" m/ B, W5 P0 S0 H/ ?Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
! `) [5 g5 f, S/ _3 g2 m" D0 H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)) T4 [* c F: n) l
e.g.1 [& S3 d3 W L$ z7 l$ o
0 + 4294967295 = 4294967295 (max)
- L8 O9 G1 K% U1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)" e& w/ ^/ }! R3 ~2 B
and so on....
! M! {) |# D# E+ W) n6 @( C. V5 I, `* H }
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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