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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:* f- p# p7 n2 ^ Z
有無人知點解?
3 j+ w1 c5 Y1 l, ?, S6 _Server 的Backup Code?
/ g- h# {0 X; c/ m" _- _2 b/ Vso funny, thanks a lot! % t& ] {! R8 `; a6 q% H8 B
* R+ J1 e# {- }. a好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
/ s* ]$ [: [0 n0 ^& }Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) 7 B" g! {* E4 G. J k1 x! L3 B
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)
' s8 P0 \6 ?6 ^( H0 z/ Re.g.' t6 f) F4 l+ S, i6 S& t
0 + 4294967295 = 4294967295 (max)
$ }, p: r! W4 M% g0 |1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)& F1 O! @4 d! q" Z8 `4 J
and so on....
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; e- ^, f. o% V[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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