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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:
% W, _9 f7 D& e$ J有無人知點解?. o: n. E: h" ^1 B# G
Server 的Backup Code?
9 J0 e: V3 v2 @6 W4 yso funny, thanks a lot! 8 u6 I7 K) M9 S3 R& @# g, e0 ~* U: ^9 {* S
好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面8 m7 W' G4 K A% K5 A
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
! a6 _% G5 O, e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)
5 x; \& ]* B+ be.g.( m q2 ?8 z( Y( P% C
0 + 4294967295 = 4294967295 (max)
; P5 q. {0 q) a% a1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow): U* e% e) e8 d3 S: w1 n* j; r
and so on....* R+ x( q2 g) g: o, Z! q/ E7 Q
/ ^/ n$ `& F9 i. q, D4 W
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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