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發表於 2005-6-19 06:50 PM
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Originally posted by secretfj at 2005-6-19 06:37 PM:' A" S* d0 k$ Z+ a/ z9 X
有無人知點解?. b, G1 S* ?: U- Z9 H
Server 的Backup Code?
, {) i5 v7 |( _# L Aso funny, thanks a lot!
好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
; v( b4 I( s! U& K9 zMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) . b6 P% {( V4 S+ y- A3 `2 q
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)
* I5 @' v* T9 z: O: l, N' `e.g.& W1 `1 l4 s6 m2 E1 O" |3 q
0 + 4294967295 = 4294967295 (max)
. ?: k0 o! O( y6 A8 }$ j/ @: J9 _1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow); Q! ~6 U# y! P [* m
and so on....
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: R2 ^5 G% A) F+ \[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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