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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:
+ b1 H! b" z! Y' [有無人知點解?
9 ? {" t7 T' w, ~8 ]Server 的Backup Code?: L/ ` n1 x9 I6 l2 C4 M8 u, ~0 r
so funny, thanks a lot! ! U) r2 |4 C% }/ w
9 O5 H) h# h9 |; @6 H: u好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
" t# i' r- A: ]4 ?* J$ r3 l, j7 oMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) 0 o; O2 }/ B! F t ]
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)
" w) a, ?5 ]4 [e.g.
6 K- Q8 n# H" n+ M" U7 _0 + 4294967295 = 4294967295 (max)% _4 V4 ]( J7 p: B) M* q9 t _; ^
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)
. H/ F% S8 v* C( n$ D* Nand so on....
( ` C0 w/ ^/ C t+ |# a \# X- ~4 k8 |, J; n. ]9 O, F7 Q. M
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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