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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:
+ M- W | O2 i有無人知點解?
- i: r4 y! W0 y U9 eServer 的Backup Code?
( W6 v. Q( s& t0 R( r* wso funny, thanks a lot! 0 q3 \) c& t! z& }3 ~: j8 U$ [
2 u: E9 s0 E7 I3 P' L) y& s, x O好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
7 T/ K* K; l$ x6 r, ?Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
/ B' `# d( v1 s* C$ |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)# q' Z0 D( O; Y# R' B5 `
e.g.
Y* I5 ?: j5 \. a A0 + 4294967295 = 4294967295 (max)& p5 T0 w6 M- I" z$ ^% g
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)( O# M& c. Q% p5 B5 N9 x
and so on....
9 O9 D W, _/ @7 g) h0 G5 b* V: V/ G' x, |0 d3 y
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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