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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:9 g9 q$ o+ O) m. _, t4 |
有無人知點解?- Q- p, n4 y x; ^1 a O
Server 的Backup Code?: c8 \* h5 l' b" Q8 \% u
so funny, thanks a lot! # ^+ c* z3 L: z1 n$ t( x
3 W. c: `+ P3 x. j5 f. M好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面3 B$ ?+ V4 M8 O: o6 H1 S* H
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
; _, J& i" e& F* N- 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)1 r0 U. J% T4 y6 n [ ^
e.g.- b; t. ^. X, A, w
0 + 4294967295 = 4294967295 (max)
- b6 Q& c% Q: e- C- ?# o9 z" a* _% n1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)
$ d1 G# f+ c' qand so on....! b. t3 b' ^3 V2 K- u& u
+ u3 `. u3 e8 q( S' I- u[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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