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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:1 H4 H7 m; m& _$ _5 u! T" T) i
有無人知點解?- m: t/ H- i6 j: u+ E1 H0 b5 k
Server 的Backup Code?1 z6 U4 {/ W/ ]
so funny, thanks a lot! ; J# U* D+ {. Q1 x0 [) @" f) Z
/ {* Y h& k9 `( R6 t! U( K好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
. b% I% e7 |# PMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) # x9 l4 n$ J& @: i% @$ g$ w# L
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 s, y6 Z8 O" H/ z% _ D
e.g.
4 g9 i" N, H0 Z0 U5 t* g: ]: q0 + 4294967295 = 4294967295 (max)/ S# H7 s0 i w9 H' W4 ~, j
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)
( p/ v8 }' V& R4 @and so on....* Z- R* b* C5 {% D4 [
$ ]9 \' ^" g: O. Z5 ^[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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