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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 O3 Z% C3 Y, S O有無人知點解?
) Z) w3 \ v% I5 l6 W8 rServer 的Backup Code?
# e, x. A) S1 f$ R7 ?so funny, thanks a lot! ; a, K" m3 }+ @) C! ^" A) P& `0 h
4 ^. f6 J" J1 `, F. @1 I Y好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
# ]) I `7 Y. U3 D6 A4 zMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) 5 a' G1 P: \" j0 I0 j5 g/ g
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)
" g- L# g8 O- Y9 |e.g.* r2 Z* u5 o# r! q9 p- H2 C# o6 ?
0 + 4294967295 = 4294967295 (max)
+ G, X; c: u" V% @, o1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)6 g- h8 D$ n$ \/ I1 X
and so on....( W' j, o/ n' C L9 W: W/ I
4 u7 s1 v. z- d9 m* J
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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