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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:
$ _6 |4 o0 o! [5 P( V6 ]有無人知點解?
1 Q3 C# y! g' Y9 bServer 的Backup Code?
2 Y; h$ f f" N* I! |* z* n: G) Qso funny, thanks a lot! ' m( h& f- t- G( D7 o
' n9 a" u+ m2 m! P9 j- S" W$ s. b好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面2 X3 ^+ _1 U. P ]: u- y/ W( a
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
8 T% P& B5 n5 J/ 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)
. f- n3 ^$ `9 `( m/ k; ?. ?e.g.
% X" o( y; \7 ^6 t0 Z0 + 4294967295 = 4294967295 (max)/ @) u4 x0 c/ F% S+ [$ L* b& W4 c
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)# \: D- P/ P' Z* |; Y
and so on....& V A, m! I' t$ D
; Q4 h! U- N* y: D, e( `[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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