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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:0 q: s" v- E9 V9 d9 g- N" N
有無人知點解?/ b5 W- N1 @" u4 F
Server 的Backup Code?
# e, C, C# u8 H; i& [& V/ Z; Cso funny, thanks a lot! 9 X6 ?8 {8 P7 Y/ ]4 L
a3 \" I" H! i% E/ w好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
% s6 a% B+ y) ZMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
) K/ g q6 R9 r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)
; y J- S( {: i h x8 he.g.
. F$ ]% z# s j. I% t# x. {# h0 + 4294967295 = 4294967295 (max)8 l' ~, L* ?; P5 H x. S
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)
/ _8 U$ D1 |- g# s" S" M1 x$ xand so on....! u, P: P6 {4 M5 {4 m
) {% e% B) h8 }5 x; x8 F$ n# T[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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