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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:
- C8 \( L% L8 l' r7 ^有無人知點解?. P3 ~; H( \, _1 f$ |4 L7 W) H
Server 的Backup Code?; K6 u2 g1 D- O0 C
so funny, thanks a lot! : k% L& ^' P/ a7 x9 _8 @- w# C- C+ a
) _, v# F; G, T! h" i. w2 a好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面3 c5 \6 Q4 T" B" d2 ]
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
4 u: r! i8 M5 Z7 V+ l+ q+ ^! [' N個 value 過左呢個 range 就會 overflow , 佢只會理最後個32bits 數 (即係好似返返轉頭 , 循環咁)5 c4 B; _$ K% _+ o
e.g.) x2 P& I+ E0 R1 G) t% z- ?, Q
0 + 4294967295 = 4294967295 (max)5 J" S( ?! R) r. Z, p+ ]: D
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)
+ b# e/ g6 l @0 O* Dand so on....8 I( s- E' k9 `* R' d7 m0 X, D
, C8 A3 h" \) s& l4 W; A
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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