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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. I9 L+ B+ F% o有無人知點解?0 i) z& t. [2 R: C: `* s6 T- Q
Server 的Backup Code?
: [0 r* G) j" I2 ~. `$ s8 z) H; Wso funny, thanks a lot! % J* z8 E# }6 |0 r4 ^+ m, @
, `0 `7 F: h/ E. P$ Y# L' p- y好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
1 g0 r: z! ]* Q# z' v* MMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) : ^% i/ Y0 j5 J. `9 _* J
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)
: i' M% H% N/ m# {) Re.g.
: H% X t7 a! ^6 W0 b) |0 + 4294967295 = 4294967295 (max)$ t- ?* k4 C9 `5 w/ l; p
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)( Y2 V- e, S1 }! l t8 F# I3 @! z4 w+ d
and so on....
. |$ h5 a b4 A7 O7 A* F! b# U- N7 H# D% @: _
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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