<2019年12月>
24252627282930
1234567
891011121314
15161718192021
22232425262728
2930311234

统计

  • 随笔 - 4
  • 文章 - 0
  • 评论 - 1
  • 引用 - 0

常用链接

留言簿

随笔档案

搜索

  •  

最新评论

阅读排行榜

评论排行榜

2010年3月24日

char* string; 与 char string[]; 有何区别

char* string; 与 char string[]; 有何区别?
以下代码中:
        char pBeginPage[10] = "";
        char pEndPage[10] = "";
        itoa(aBeginPage, pBeginPage, 10);
        itoa(aEndPage, pEndPage, 10);
        temp.Append(pBeginPage);
        temp.Append(L"-");
        temp.Append(pEndPage);
pBeginPage 和 pEndPage 可以声明为 char * 类型吗?

posted @ 2010-03-24 18:53 hzpfly 阅读(215) | 评论 (0)编辑 收藏

2010年1月26日

开始学习《ATL Internals 2nd Edition》

Chapter 1 Hello, ATL
Source Code: www.sellsbrothers.com/writing/atlbook
请大家到以上链接下载源代码,书上的源码不全。

下载的源码都是只读属性的,不能编译。可以全选后修改属性,去掉只读属性即可。

posted @ 2010-01-26 22:06 hzpfly 阅读(180) | 评论 (1)编辑 收藏

2010年1月10日

Pi buster: French software whiz claims record

PARIS (AFP) – A French software engineer said on Friday he was claiming a world record for calculating Pi, the constant that has fascinated mathematicians for millennia.

Fabrice Bellard told AFP he used an inexpensive desktop computer -- and not a supercomputer used in past records -- to calculate Pi to nearly 2.7 trillion decimal places.

That is around 123 billion digits more than the previous record set last August by Japanese professor Daisuke Takahashi, he said.

Takahashi, using a T2K Open Supercomputer, took 29 hours to crunch Pi to 2.577 billion digits.

Bellard took 131 days, comprising 103 for the computation in binary digits, 13 days for verification, 12 days to convert the binary digits to a base of 10 and three final days to check the conversion.

The gear cost "a bit less than 2,000 euros" (3,000 dollars), Bellard, who earns a living as a software consultant in digital television in Paris, said in an email exchange.

"It is a completely standard PC. The only unusual thing is that it has five 1.5-teraoctet hard disks. Mainstream PCs generally have only one 1-teraoctet disk."

Bellard has placed on his website details of the achievement, including the use of a high-powered mathematical engine called the Chudnovsky algorithm that chewed through the computation.

Extracts of the 2,699,999,990,000-digit outcome have been published so that they can be compared to preceding records in order to gain independent verification, Bellard told AFP.

Files containing the digits are also being offered to any outside organism keen on hosting the record, he said.

Pi, the ratio of a circle's circumference to its diameter, kicks off with 3.14159... in a string whose digits are believed never to repeat or end.

Bellard said he was "not especially interested" in Pi's digits but more in taking up the gauntlet of writing the software to carry out the arithmetic.

"Optimising these algorithms to get good performance is a difficult programming challenge," he wrote.

From http://news.yahoo.com/s/afp/sciencemathematicsfranceoffbeat

posted @ 2010-01-10 20:20 hzpfly 阅读(217) | 评论 (0)编辑 收藏
I want to write diary every day!

To improve my writing ability, I want to write blog every day!
Today I recognize one important thing:
  You must research the code to improve your programming level, not search in Google!
  From now on, I should not find information as soon as I encounter a problem. I will research all the information I have first! I can review my codes first, I can read my books first; I can research my documents and papers first. After all of these, I google my problem then.

posted @ 2010-01-10 00:31 hzpfly 阅读(133) | 评论 (0)编辑 收藏
仅列出标题