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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:
7 X5 b0 E! B6 U) H+ G有無人知點解?( C$ }5 @, K) v3 z! I' l5 a! f
Server 的Backup Code?
; i' T- Z2 m* w/ b. Q7 Wso funny, thanks a lot! % x7 ?0 ]' e3 s. B1 j7 y9 |8 i
5 I! H, p% @' o6 Q, K3 B& b( |好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面, }# l! v- |7 M; A' z* I/ J
Maximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
/ f0 A+ K4 x, G8 ~, ?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)( t! S" T" z2 F2 ^/ a6 ?" D% T
e.g./ J. t+ {! D( t. y
0 + 4294967295 = 4294967295 (max)+ O3 X$ e# n6 R% r% Z
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)0 v, U, p1 L& b$ s0 {
and so on....
$ c* q F5 o3 ]* _, v I; k" y' S- z# I& b, e5 g' N5 N
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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