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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:$ B$ ^3 X. u1 e8 A9 X4 U# l+ x9 P
有無人知點解?1 H# q( k/ b: e9 g1 p' K
Server 的Backup Code?& t, P9 Y5 M/ v; V0 C6 G7 \
so funny, thanks a lot! 5 x, c6 g& Y4 Z- }. \" O
" _# C7 C0 ~% V9 }% K好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面- ]+ O# ?' h" O; |+ u7 o8 e, K
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) % V+ J+ i" E. 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)
2 ~- e, G" o3 d# ze.g. r8 m% L3 L' y! [5 m
0 + 4294967295 = 4294967295 (max)
3 M' L/ w( ^0 t2 _% K8 H! Q- Y1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)) V7 @3 x3 D3 i! U8 N; t
and so on..../ h, {4 Z/ I) {. A' S( V
8 A9 T( Q/ u0 i3 O, g( T w ][ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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