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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:$ |8 E' j8 N1 D& [: S- A
有無人知點解?
' D7 Z2 M4 h% a6 zServer 的Backup Code?7 t' |5 \! J- e L6 e1 m- ~3 U+ _
so funny, thanks a lot! . C) Y+ d( g- B# G+ Y% J1 D C6 k! `4 `# N( S$ I2 C* B
好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
/ ~3 h! [( D4 b* M0 ]; b) CMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
0 D1 {+ z: g, {. P2 d9 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)
~, K2 E% U2 xe.g.
2 P6 X4 a v' I3 B3 X% y; _0 + 4294967295 = 4294967295 (max)
5 W( Y6 d& N1 [1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)7 V. M# d; H S1 k' M
and so on....
) Y( h3 j' R* S
; M1 A, Q3 f F3 q[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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