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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:
5 k) a: D0 Q* {有無人知點解?( Q) X. L$ x; S. Z' g/ Y
Server 的Backup Code?
/ O3 s" e" M2 u* Q# Z3 X1 O8 ?( Aso funny, thanks a lot! ! H9 k, W8 X& C \8 a7 Y' ?2 ]& D* a' l$ m8 K( A( r5 P# g3 L
好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面. I- A* a( w ~
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
1 J, H% T# [7 z8 q! F6 E$ G; W7 H( o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+ S% }1 `6 g# m( E( \e.g.# |) G+ |: h1 D [, s. V3 W
0 + 4294967295 = 4294967295 (max)
- D9 \8 p1 l( N; m$ ~1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)
6 B( b9 S, J, w) }( _7 sand so on....$ s$ k. v) i& m k: j6 z9 w% i Z
- x/ _( k& i% {5 z, V6 i
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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