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This problem has actually plagued me for a long time. I have asked many people what is "null? What's the purpose?
Most people answer: "null is a special 0 defined by the system. Pointing your initialized pointer to it can prevent the evil effects of" wild pointer. "
Today, I met a C-language pen question, which
The so-called generation of documents is to copy the relevant directory table of the file to the area specified in main memory, the establishment of a file control block, that is, the establishment of the user and the file connection.The so-called closed file is the user declared that the file is no longer in use, the
1 in-progress validation of the document 2 determines the rendering mode of the browserStandard mode is strict,Weird patterns and promiscuous patterns are not allowed, old, wrongBusiness hooks with progressive enhancements elegant downgradeIncremental increase is mainly for the bottom version of the browser for page construction, to ensure basic execution. Interactive and improved for high-version browsers,
The first is to use manual or automatic means to run or determine the process of a system. The purpose is to check whether it meets the specified requirements or to find out the difference between the expected results and the actual results.
Second, software testing is to carefully design a batch of test cases based o
declaration. The same is true for XSL stylesheets. The first line of any XSL document is actually an XML declaration:
is XSL the same as XML?
Both and not. Yes, because they follow the same grammatical rules (only a little bit of difference, as I'll say below). No, because they are different: XML is used to host data
Recommend a text Dr. Hangyuan Li on my understanding of machine learning machine learning and natural language processingHttp://www.thebigdata.cn/JieJueFangAn/13162.htmlDr. Hangyuan Li's "Talking about my understanding of machine learning" machine learning and natural language processingThis article is well written, and it is understandable to get started.To know that w
method we have introduced to use and describe more devices and objects, and there is nothing special about it.
B. What is Lun?
Lun ID is not equal to a device, but a number. It does not represent any physical attribute. In our actual environment, the Lun we encounter may be a disk space or a tape drive, or media chang
What are JDK and JRE? What is the purpose? (Post)
Article category: Java programming
You must choose whether to install a separate JRE when installing JDK. It is usually installed together. I also recommend that you do this.This helps you better understand the difference
What are JDK and JRE? What is the purpose? (Post)
Article category: Java programming
You must choose whether to install a separate JRE when installing JDK. It is usually installed together. I also recommend that you do this.This helps you better understand the differences b
What are JDK and JRE? What is the purpose? (Post)
Article category: Java programming
You must choose whether to install a separate JRE when installing JDK. It is usually installed together. I also recommend that you do this.This helps you better understand the differences b
What are JDK and JRE? What is the purpose? (Post)
Article category: Java programming
You must choose whether to install a separate JRE when installing JDK. It is usually installed together. I also recommend that you do this.This helps you better understand the differences b
The program is written by PHP a websocket server, the client is connected to send messages continuously, the service side is responsible for responding to requests.
Tested: Once per request of client, server PHP consumes time of Microsecs to MICROSECS (message size is different).
The server
The complete process of performance testing work, the purpose, and what is most criticalSystem Test Categories: Functional testing (correctness, fault tolerance, concurrency logic, associated content), security testing, performance testing (stress testing, response time), strength testing, capacity testing, recovery testing, user interface testing, inter-interfac
Career planning has now become a fashion, but what is the purpose of career planning? Some people have a profound understanding and regard career planning as the fundamental guarantee for career development. Some people may have misunderstandings and are still confused. They believe that career planning is only require
The recent author every day from the major webmaster forum to see the most is the "site ranking how to rely on the front" topic, ask these questions stationmaster most is to do search optimization has a year or so, for search engine ranking rules of a smattering of the state. They are looking for a breakthrough, to find a way to overcome their competitors, and here I also discuss with you some of my views o
What is the purpose of php's cache technology, especially the smarty technology? I know it is cache, but what is the main purpose: more php Cache technologies are designed for specific
The real parameters of a function can be more than the form parameters. what is the purpose of this function?
Function test ($ date, $ value) {echo "$ date $ value" ;}$ date = "September 18"; $ value = "100"; $ y = "2 "; test ($ date, $ value, false );
The real parameters of a function can be more than the form parameters.
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