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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:
G6 j4 d- K/ [+ Q% f* J有無人知點解?
* `/ D, [0 [# y/ M4 L# X0 t7 YServer 的Backup Code?! P! k2 D- ~+ x# ?/ R3 G
so funny, thanks a lot! ' b. R8 a- ^0 Z1 ~1 T; |
8 R% I( y, d: \. c* }6 w好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
3 T$ U D' B# Y5 e2 Z' a! p dMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff) 5 u, Z* B4 W4 ^* G8 B
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)6 c. J2 e" s" Y( Q
e.g./ h$ l# P* C2 ~8 {9 ~
0 + 4294967295 = 4294967295 (max). Y9 D8 d! ^4 A6 k+ w
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)
' ?8 l. r8 P$ ^* ~& Vand so on....
8 `: ~8 q1 `6 u" A8 M/ L: X0 ], V! Z6 Y0 h3 N0 [
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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