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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:
, R& I, a7 b, C3 M# v有無人知點解?
5 u% g$ r( I1 C/ `- UServer 的Backup Code?
, n, l* S) C( |1 _so funny, thanks a lot! & p$ ], Q5 [ K: Q# K" j8 m
; y* \0 ^- P6 F4 p1 Q: m( e好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
% w/ T! G, t6 d. I8 b# SMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
! R& Q! N" d. {) Y, Q- r+ q+ ~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)$ {9 p6 S$ ?4 k* X8 x5 d6 B4 x6 Z! K- w% E
e.g.; V+ O& ^, F4 P! V- L2 v; o5 v
0 + 4294967295 = 4294967295 (max)9 v% m6 d. e* S0 H
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)
6 r" G5 D% Q2 r& U- k% b2 f+ jand so on....
; k; u" p: x7 j% K2 v Y4 \' c: c& ~ }0 O; g& u9 g
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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