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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:
/ h4 ?0 U! }6 ]+ U) M% u有無人知點解?9 f# u; |1 d3 F4 c( [6 R0 c
Server 的Backup Code?4 a7 r. |4 t# `5 W0 r3 ~* C2 v3 R
so funny, thanks a lot! ; q2 R% Q, E3 d j) p. A$ S; p
! T; P! B* [3 a, T7 D! l6 ~8 ]
好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
, a/ E5 ]! `5 y* W2 e+ H7 }+ aMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) & @$ _9 |% a7 u+ `9 a3 ]
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)
3 o& i3 t( o7 a9 G3 e. `' P1 [8 ~e.g.
$ V0 u6 Z& b* M, q) O9 ~* Y# \$ n0 + 4294967295 = 4294967295 (max)
% A5 D8 A! ]2 s1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow) E/ C6 i' R, J
and so on..... O, Q `; Z( K0 F
@6 h. F3 y; O[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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