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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:- Y4 V" v& i* @5 H* ]5 t
有無人知點解?3 z) ]: ~# p; F- ~ W Q/ |
Server 的Backup Code?
# P0 d% W% ?: n% u+ ]so funny, thanks a lot!
$ N3 R( Y# L8 p# ]/ {
好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
4 `( D# B% `7 f; x; i2 W- A6 gMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
. h% r) _% t8 J* M+ e0 v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)
( e3 i. O$ G3 K4 Z: [e.g.- j+ g" \4 p: N q0 u
0 + 4294967295 = 4294967295 (max)
" s' Z& h7 q+ t1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)
% M' K7 ]5 o! k& M# Q* j& {# z6 _and so on....
. p4 Z; |6 g3 @8 T& T
; b( j/ R3 z. q+ d+ H9 H. H% ]2 K) W[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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