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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:
4 F: B# h2 P. |/ i有無人知點解?
7 l8 w9 g: y# A6 h; z$ J8 eServer 的Backup Code?
, [: S8 I& R' K& `" E2 Oso funny, thanks a lot! : \; G4 S6 ]$ `% n$ {$ M; g1 d
$ I/ k y5 N/ M/ {( w好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
4 S, A9 n' u9 ]8 }, U* I# c2 aMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) . s/ Q4 [9 h" L8 S6 A6 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)
N1 P6 I2 f* }, F+ O! he.g.2 W$ R( N8 B8 V& q% a9 s' O" I
0 + 4294967295 = 4294967295 (max)' [; Q. T' U, c# _. d2 w
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)7 h2 o) d/ F j1 V; x* W* A$ a {3 J
and so on....8 A r5 y3 T/ o+ [% z* ^7 a G
& y9 S4 Z, b* U* {6 q[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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