 
- 帖子
- 362
- 精華
- 0
- 威望
- 126
- 魅力
- 0
- 讚好
- 0
- 性別
- 男
|
3#
發表於 2005-6-19 06:50 PM
| 只看該作者
Originally posted by secretfj at 2005-6-19 06:37 PM:0 e/ r# T: ^& s# g: J' z5 \
有無人知點解? n0 p5 s. x' L% K% Z) I2 F
Server 的Backup Code?( v) b% D- H: c
so funny, thanks a lot! " s+ H* N' u6 Y! V6 ?' K
7 c% d, c+ o8 I2 k2 Z# ?: o
好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
p( k( u7 Z y; {* zMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
9 B& A. \9 W5 t9 w2 K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)
* Y5 w, J+ I- V X- q& A3 o! \- ze.g.. L- A& _3 ? Z# I
0 + 4294967295 = 4294967295 (max)
2 Y$ {" [; n# G4 }; m( ~, h1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)
6 ]2 ~; F+ x% Z3 W( m1 [and so on....) m) j' r% D: {2 W
: w5 z( N( y' {8 J
[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
|