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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:
+ K# a: S' O% E- L* W- G有無人知點解?) b. l; n. a( {! p9 a" a. x# P' c% j
Server 的Backup Code?+ o" E: y, S% Y. O3 v
so funny, thanks a lot! 2 U) G# Q4 t6 n: ^% K
( Y1 [* h! ]+ _2 p: {7 [! k好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
, N4 |9 w3 `1 v/ H$ V; a BMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
. t, G# C c3 v5 c1 R) [, 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)3 W+ @) o b9 s1 [! [7 m" P" a
e.g.! \7 P" p% W* I K- v9 Z: x& S# l
0 + 4294967295 = 4294967295 (max)3 K4 z4 `1 L& _
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)
# u' W) N3 i. m0 C4 m( Xand so on....- I. V$ x& g3 J/ A4 M J4 q
- x- _0 D% x6 R1 b( d: \. t, m[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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