gaye

Originally posted by secretfj at 2005-6-19 06:37 PM:5 z5 o, K1 T& u) l% M6 R
有無人知點解?  E% V; O+ i8 _3 ~! t  q7 d
Server 的Backup Code?6 X/ X, d4 E/ B( i" |, r& \4 l
so funny, thanks a lot!

6 ?+ N9 f+ t' }2 G8 C( U" f$ z) [
0 i/ H* D& v' L' G) d好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面' I# F- H- f! s% ^% f. v
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
* X2 V% Q- t5 L! K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) b2 J5 ~# S8 x4 je.g.
7 w1 ]. b- T, ]- ^$ X2 c9 q0 + 4294967295 = 4294967295 (max)
2 q% _, L3 I2 Z7 \$ j0 s1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)8 m4 r' I. ?3 T8 \& i. G/ }
and so on....0 }7 S2 z# f  l

$ G9 l: G6 h6 a7 {+ A# w[ Last edited by gaye on 2005-6-19 at 06:57 PM ]

gaye

Originally posted by crap at 2005-6-19 07:14 PM:
1 y3 c# v% ^0 p( h0 @
2 s! V) \1 ^7 N/ A3 x& H9 s6 k, p
嘩

: \5 @4 [/ w* c4 \
6 |3 }3 ^0 O0 c) D0 D6 {  O; `1 Q. X
小弟都係比較多睇電腦雜誌