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發表於 2005-6-19 06:50 PM
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Originally posted by secretfj at 2005-6-19 06:37 PM:, u% R9 O, @0 f( d# G2 X" Y* }" }, A
有無人知點解?
% |; [1 G2 g2 i$ |$ Y! }0 G( KServer 的Backup Code?
, F+ W! u: F) d3 [so funny, thanks a lot!
) A1 F/ T$ t7 e$ |5 [; w/ A$ |好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
4 v: u/ P$ u- t! oMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) * W6 f; i' D3 `2 \
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)
; S- y) [- i" R# V4 m Ee.g.
2 C' F3 y* D/ T f$ Y9 G; x0 + 4294967295 = 4294967295 (max)8 N4 [8 a/ c9 {' _
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)8 O: h7 }; _- T0 P7 I2 h8 q* ^- U1 f7 a
and so on....
* E) O. p9 } r! X0 p9 s* X) N" k1 j- ~# ]) o- n0 M
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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