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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:
2 [, {6 y( [6 h5 _8 f有無人知點解?
' X4 w1 F# ?& G2 e. E3 m+ A' hServer 的Backup Code?
4 w# [. e, }7 z6 z. `- U( g( I8 d# Oso funny, thanks a lot! 5 M' g* A" J/ A$ {! Z
3 |% {1 C. C: y P% p# d好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面4 f. H* ?2 Y* L6 n5 p- ]8 _$ Y: ^8 D2 n
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) 7 v8 s" B8 T) V t5 k5 ~6 R d3 ?
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)
4 w! a/ G. K# }e.g.
* l( T8 D4 |( j+ l0 + 4294967295 = 4294967295 (max)0 Q4 Q: ]& D' V9 j4 K2 P& `
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)
5 a$ {: W5 W j- _- W; kand so on....; A3 X# |8 Y5 W/ j$ s% J
0 C4 L9 W* d7 m
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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