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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 D" W# f+ m( G, ^* a
有無人知點解?& M+ q" T( @5 C* _5 Q9 G# k
Server 的Backup Code?8 ~, d0 J$ w; e1 j7 ?/ c
so funny, thanks a lot! , X3 v/ G9 E) o5 i: @$ U9 e$ ?9 s: x3 O( F
好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面# N1 g+ |2 ]9 i" j
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) 0 s$ z; w7 F D2 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)/ A- [6 ~$ T8 C( K
e.g.& ~. G W! S) j2 k
0 + 4294967295 = 4294967295 (max)* a }" K% c' \) X: T3 x
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)0 Y) S6 n* S9 {6 _5 h
and so on...., O( q& v( |3 t& S9 p* x2 F/ p# H
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[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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