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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:: @8 j/ B. B2 p+ _$ m( U3 O, U- P
有無人知點解?, D3 G! ?2 ~/ E m, I. e. E; x
Server 的Backup Code?4 v, ]$ Y- V6 Y# g8 C
so funny, thanks a lot! / o) V- e6 k0 b( U
; J# ?! {$ Y4 L' L) t8 S好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
4 G: z# B& M& S9 ^" fMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) 8 n- t8 g- v- R' @ A, a( A
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)2 C$ V* b, Y9 h+ L
e.g.
* |; w* h# N" b/ A0 + 4294967295 = 4294967295 (max)
+ N# f. `, q$ q1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)) e* Y4 ~& I, G) u( s
and so on...., y; R1 F* i [' V+ L$ a
1 N# y( ~ h" ]- \6 o3 U% q
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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