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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:0 o& O8 \/ ?; _! A4 `6 r
有無人知點解?, I* H: L7 i p7 J1 N! A; p
Server 的Backup Code?% M7 n8 G' ^- d! L0 w- B
so funny, thanks a lot! : E& h4 V0 l" D& j3 E2 F
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好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面: u3 I( ]# _& v. D( s8 u7 t* ~
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) 6 e+ ]/ h6 T+ F+ k) 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). F1 k: ~5 j& g; h- A! x
e.g.& j5 \3 M! M$ g6 B2 d
0 + 4294967295 = 4294967295 (max)$ Q, u8 U5 n" f4 I* `9 B& b0 ~- ~, H
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)
( \$ D+ R! Z! K; Hand so on....
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( w7 i$ A1 G( a( b% u[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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