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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:1 g, m0 ~+ R+ d! `
有無人知點解?2 {7 k+ a8 O- O J/ E+ v7 F, w
Server 的Backup Code?6 ~! O% E, c2 f1 ^" { z) M7 {) A
so funny, thanks a lot! - o$ J O3 z7 l/ S
# N6 {2 }; S2 O5 i! z, H好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面* R" H5 h& g7 \: L
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
1 g ~% J) j9 o: T0 J) y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 s! ~* _% L0 p, R* ^3 s7 y, r
e.g.
; {7 i+ H5 ^# k. \. y/ I0 + 4294967295 = 4294967295 (max)( Q B& a: n. T" m* a3 p
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)" H+ ~4 P; n3 u' E* j0 u
and so on....
2 m8 s* |8 J1 h/ ~; P2 I2 o! e
) Z" J! p( V, D6 _5 m[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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