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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:
3 J) L- R( e) d# n% j! M% \# E, _* Z* u有無人知點解?
/ w3 ^& H/ H/ {2 QServer 的Backup Code?
( \9 O: S/ W3 H' x, pso funny, thanks a lot! 2 Q" W/ b2 Y1 y% ?0 m
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好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面& G4 t4 r1 A, ^) U: i1 l( p( f+ y
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) $ n' x0 X% }) [
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 K, \2 T d# u: _3 Ge.g.3 E. K' T( P6 V% Z$ O- T
0 + 4294967295 = 4294967295 (max); R: \; I% v, ?2 Q) t9 e1 ?' ^' s
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)
0 a- K9 }9 Z" O; A* _) Pand so on....- ?, S, n/ L' W- M: |" \# N: q
7 g- L; X/ D, O[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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