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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:, i4 ]4 k2 p2 \+ Q
有無人知點解?
. o, k5 j- ~5 W9 G6 f ^* }Server 的Backup Code?
% B O1 G2 b% yso funny, thanks a lot! 2 S4 U1 l) V. U2 A( S1 }" d( C& d" s/ w1 Z3 N5 W! H" j
好簡單, ICQ 應該係 Visual C++ 寫的 , 而係 Visual C++ 入面
9 @5 W# X6 F! QMaximum value for a variable of type "unsigned int" 係 4294967295 (0xffffffff)
# j# W3 w0 Q: _% i5 K, E) L0 w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)) C9 a0 E! o t1 o9 N, }+ q
e.g.
4 Z9 n. ]0 Y0 ]+ b0 + 4294967295 = 4294967295 (max)+ }8 j! C) j, P, E
1 + 4294967295 = 0 + 4294967296 = 0 (because of overflow)* w- D; M. d0 V4 }$ \) v* t. Y
and so on....
, t. w% t0 m, x& `% x4 B
0 j) E% I2 _/ L# R[ Last edited by gaye on 2005-6-19 at 06:57 PM ] |
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