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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:- \' L' j# p; x9 B/ ?# R9 Q. A
有無人知點解?% ^& b/ c8 |7 V% A5 w7 O
Server 的Backup Code?# h$ l, `* s6 s% I
so funny, thanks a lot! % c: d6 b$ Y" o' d/ [; D8 N
$ N. D# I) ]& U; P6 z2 V7 b好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
0 J% h3 i; P( ^. i3 d1 SMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) f: t# i' R; D8 y7 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)- W- l/ {( B( p$ A/ N* i6 S* ]
e.g.; a, @ s7 s+ M& \
0 + 4294967295 = 4294967295 (max)
" N1 C2 X/ B1 t6 d# h1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)% r( i: f; u4 N2 d2 W' r
and so on....
& U N8 c+ a8 _6 \$ ], C. k& q; `* O' M0 K! G) D$ J
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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