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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:
/ |2 f( K9 j. F, d有無人知點解?- z" P$ l. ]7 p/ M8 c: I, X( G4 ?
Server 的Backup Code?9 ^+ i; c$ n' h
so funny, thanks a lot! / B) k( D& L9 M+ b0 \6 Y
. a0 E1 h2 C/ u7 Z Y7 l2 q9 j, Z好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面3 F1 Z4 m3 i2 \/ _- w# M5 u, `7 j
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
?6 R! p0 Q9 ?' h% L( @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)0 @- G2 t ]. i$ ]; ?
e.g./ Z0 k* D1 ^- |8 l2 p
0 + 4294967295 = 4294967295 (max)& X/ {, X/ @* f8 B1 O2 a) [7 ]
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)5 v3 s2 e, q5 |- d; p$ c5 x1 R
and so on....2 \. x9 I% c( Y: S8 k
) \4 \0 ?% s% L/ @
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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