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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:
) Z9 o0 w3 i; n$ A6 \有無人知點解?
' f$ h# Q8 T! eServer 的Backup Code?" Q0 `+ A7 A- E. u/ N
so funny, thanks a lot! 7 l4 S- ~& M, [3 P, Z5 [: {* ^: V8 q u& O4 p2 v! A
好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
- |2 Y) G- n6 ~( xMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
6 L2 A5 u, d# K6 b0 l; E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)
7 b4 I& M7 g' b/ R4 De.g.
! N0 v* @( ^/ T( b& \& g, T0 + 4294967295 = 4294967295 (max)+ Y' R+ p' C, } s5 L' r Q
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)
4 ^9 d2 l! c3 [2 Q$ ~and so on....
0 x1 G: ^! B; M1 O- F' B5 m, G. }! m1 t' p7 `
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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