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a shortcut for linux( from linux journal )

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posted @ 2008-03-25 19:21 丑石閱讀(618) | 評(píng)論 (0) | 編輯收藏

10 things you should do to protect yourself on a public computer (from TechRepublic )

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posted @ 2008-03-21 12:41 丑石閱讀(454) | 評(píng)論 (0) | 編輯收藏

the tips of Yum

(1) when installing or updating the software by Yum, you maybe come across the unexpected exit from the Yum tools and then report some errors which indicate some incorrect Yum sources! It maybe result from some obsolete Yum sources,so you'd better delete these problematic sources from /etc/yum.conf or /etc/yum.repos.d/ .
(2)pub－key,some Yum sources need to authorize and you should find pub－key which belongs to the source and import the pub-key: rpm －－import pub－key

posted @ 2008-03-20 14:22 丑石閱讀(217) | 評(píng)論 (0) | 編輯收藏

Thinking recursively

First,Let's know the principle:
Recursive leap of faith-
When you try to understand a recursive program,you must be able to put the underlying details aside and focus instead on a single level of the operation. At that level,you are allowed to assume that any recursive call automatically gets the right answer as long as the arguments to that call are simpler than the original arguments in some respect.The psychological strategy-assuming that any simpler recursive call will work correctly-is called the recursive leap of faith!
The idea may be difficult to newers! Take an example for it:
We all know the Fibonacci function:
F(n)=F(n-1)+F(n-2)
Recursive implementation of the Fibonacci funtion:

int Fib(int n){

if (n<=1)

return n;

else

return Fib(n-1)+Fib(n-2);

}

if n is 5,Fib(5) is computed by the sum of Fib(4) and Fib(3).
Applying the faith,you can assume that the program correctly computes each of these values,without going through all the steps that Fib(4) and Fib(3) is computed!

posted @ 2008-03-16 18:54 丑石閱讀(299) | 評(píng)論 (0) | 編輯收藏

Teach Yourself Programming in Ten Years

The article is worth reading,please refer to
http://www.norvig.com/21-days.html

posted @ 2007-05-30 21:46 丑石閱讀(344) | 評(píng)論 (0) | 編輯收藏

separate-array-of-pointers technique

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posted @ 2007-05-30 18:45 丑石閱讀(334) | 評(píng)論 (0) | 編輯收藏

One size does not fit all

People who spout off one-size-fits-all rules presume to make your design decisions without knowing your requirements. They don't know where you're going but know how you should get there.
Don't trust an answer from someone who doesn't know the question.

posted @ 2007-05-15 13:57 丑石閱讀(264) | 評(píng)論 (0) | 編輯收藏