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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 T* L! p" I9 ?* a2 [- c有無人知點解?/ I/ X \* g9 z8 |; D# I4 i
Server 的Backup Code?
9 C# e7 e2 O, {9 j) mso funny, thanks a lot! , q2 A6 g* ]! q7 K+ z- q' _) M! J i% g* N4 `1 [9 l8 f! I: `3 G
好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
2 u% t. Y, \9 k; u. oMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) + G& d& M% v* ?7 S W* Y/ r& O( {
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)6 c$ z! ] |7 G3 A
e.g.
- ] P# Q! ~1 d, I1 {2 A$ W6 x& K0 + 4294967295 = 4294967295 (max)
* r5 j+ |( k. `, @# S8 N1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)
) e/ D9 j- a6 l# o9 a E, oand so on....
/ |7 U* u4 m$ ]4 W
; B; |0 f6 G/ J. [3 r[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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