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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 d, F g/ l2 r9 K; A; L3 p
有無人知點解?
7 B% k6 s5 Z" O% gServer 的Backup Code?
1 n0 N: a7 ~8 s* Mso funny, thanks a lot! 4 \/ ~- D: C" M9 p6 T4 S7 _( `" f: ^, A! z: C
好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面 A' l& v+ M+ t, K8 y9 ^" T4 a
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) ! C5 _$ q% Z+ @" P
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 o0 }. x4 b3 @, o* u% ^
e.g.
0 b" A( v* `5 D9 s% i- q0 + 4294967295 = 4294967295 (max)" v. g) m5 a- H& M
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)
3 Y' l2 e) b' ?' m" B' Q: L6 Aand so on....* ^( L# K" O0 [* m7 ^; D, a2 V
1 k% @ l7 Z1 W* t# n6 x! F4 W
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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