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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:
* g% x1 h7 v, ] \. D有無人知點解?: ^, N( o& s9 T/ `0 i. j" \
Server 的Backup Code?4 `( M; r" Q( a) y6 G- {! F! g l- W
so funny, thanks a lot!
) e, e' e1 n3 B好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面4 j5 R+ }% F/ Z. N) L: W, w7 A9 J6 C
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
2 o& v9 c8 _; [3 E1 U/ q+ y' d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)! c/ b. d5 H* W9 p0 g
e.g.
7 ~! j8 ~0 q: z' b! ^0 + 4294967295 = 4294967295 (max)
+ L( e, s# {& h: m* A* g% E' A- J1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)3 P8 i/ U! V. N% }
and so on....
- U) d0 l+ p' Z$ F' m- I c" ^& g' d+ g1 s9 I0 Q
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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