invented cobol

More than a thousand years ago, humans used physical power to expand their territory and obtain food. Later, people learned how to use tools and started to use stones and sticks. Later, with civilization, the quality of the body was not the only condition for determining strength and weakness. Later, some smart people joined the philosophical thinking based on their fighting habits, and invented martial arts based on the principles of attacking, advan

Http://www.cnblogs.com/dartagnan/archive/2010/12/14/2003499.html Linux and Windows carriage return line break Source: "Carriage Return" vs "line feed)Before the computer appeared, there was a kind of device called teletype model 33, which can contain 10 characters per second. But there is a problem, that is, when a line breaks a line, it takes 0.2 seconds, just two characters. If a new character is passed in the 0.2 s, the character will be lost.As a result, the developers thought of a way to so

understand at a glance? Today, the computers we use are called "electronic computers" because they are still an important component of electronic components. With the electronic knowledge of my super poor hacker, I can still tell that the common electronic components include "resistance" and "capacitance". The resistance is related to it, what I learned in Middle School: "When the voltage is fixed, the current of the conductor is inversely proportional to its resistance" -- It's big! Do we have

I. 1946 Monte Carlo Method [1946: John von norann, Stan Ulam, and Nick metropolis, all at the Los Alamos scientific laboratory, cook up the Metropolis algorithm, also known as the Monte Carlo method.] In 1946, John von norann, Stan Ulam, and Nick metropolis, three scientists at the Las Vegas National Laboratory, were co-invented, known as the Monte Carlo method. Its specific definition is: Draw a square with a one-meter-long side on the square and dra

example is that Zhao yuanren used to recite the multiplication speed in English and Chinese. He used Chinese for 30 seconds and English for 45 seconds. Therefore, if two people recite the words in English and Chinese at the same time, the Chinese user will surely think of the ninth or eighth day in 30 seconds, and the English user will not be able to come here. Maybe, he only came up. This proves that the language thinking speed is faster with more pronunciation types than with fewer pronunciat

theories and obscure terms. however, its main role is to study how to encode the information contained in the world into numbers or symbols, how to transmit the data, how to ensure the accuracy and security of data transmission, and so on.Information encoding In addition, we know that the information can be expressed as any number or letter. in fact, we can use Chinese, English, and other daily languages to encode a lot of information in reality into characters. however, in a computer, the info

patterns." Deep thought. Remember the first time you look at Gof design patterns that book, found that although not previously known design patterns, but in the actual programming process, in fact, still consciously used some design patterns. The design pattern is the objective law of programming, not who invented it, but what some early senior programmers first discovered. Instead of designing patterns, you can write programs that meet your needs. H

Years ago, the human body strength to expand the site, access to food, then compared to development. Later, people learned to use tools. Start using stones and sticks.Later, the human civilization, the sword and the body is not the only way to determine the strength of the only condition. And then later. Some intelligent people based on the fight habits to add to the philosophy of thinking, to defend and retreat, sports disease Xu, rigid and false as the principle.

didn't understand it when Thompson invented UNIX. Then he understood, benefited, and no longer invented. " "When the honorable McILROY invented the pipeline, he only knew that it would pass the software, but did not know that it could pass the idea ." "When the VIP Ritchie invented C, he put the programmer in the

, not only saving bandwidth, but also making the end user experience a higher level. In addition there are. NET version of less.M- MVCThe MVC pattern (model-view-controller) is a software architecture model in software engineering, which divides the software system into three basic parts: model, view and controller. The MVC pattern was first proposed by Trygve Reenskaug in 1974 and is a software design pattern invented by Xerox PARC in the 1980s for t

(i) Web application Fundamentals(i) Web application Fundamentals1. What is a web app?A: Web application refers to the application software system under B/s structure system.(Supplemental: b/S (browser/server, browser/server) structure: Install some applications on the server side, and the client can view the relevant content as long as it is browser-based.c/S (client/server, client/server) structure: Install a software on the client to access server-side resources through the software. ）Who

DOM Level 1 and CSS 2 standards.D. 2002 Douglas Crockford invented the JSON format. At this point, it can be said that Web2.0 rely on the technical elements have been basically formed, but did not immediately in the entire industry has a significant impact. Although some of the "page asynchronous local Refresh" techniques in the middle of the secret spread of the programmer, and even gave birth to bindows such a large and bloated class library, but

The history of Web discussions on Web development technology, of course, is to start with the origins of the Web. As we all know, the most popular application architecture on the internet is invented by Tim Berners-lee. The web was formerly the enquire (enquire Within Upon Everything) project by Tim Berners-lee in 1980. The first Web server, nxoc01.cern.ch, started running in November 1990, and Tim Berners-lee saw the earliest web page on the "WorldWi

the string "ABC", another object to load the node class definition, and an object to load the abstract syntax tree parsed in the code, and so on)If we call Node.new,ruby again, we will pass another object to us:This simple algorithm for pre-allocating objects with a linked list has been invented for more than 50 years, and the inventor, John McCarthy, a famous computer scientist, was first implemented with Lisp. Lisp is not only the earliest function

, through the wire to train them into a loop, so that at my end with the switch to the closure and communication, the same, neighbors can also use a reverse way to make neighbors send messages to me.Improvement 1:We used 4 wires before, and if you use a public connection, you can use only 3 wires.Improvement 2:Because the earth is a very large conductor, because the section is very large, so the impedance is very small, so we can use the natural conditions, but we need to use a very large batter

binary code stored in a computer system, which is stored, passed, and processed in binary form. Only when interacting with humans, as shown on the screen or printed out, will it be translated into familiar forms. 2. Programs are translated into different formats by other programs Before we said the main function of the computer is to process information, that is, processing ... 01101100 ... this binary code. There is obviously a problem, the computer as a life without the intelligence of things

companies. Although China is starting late compared to the United States, Europe, and Australia, developers now looking at China are no different from the rest of the world's developers, who do the same patching, asking similar questions and having the same layout problems.　　Q: Do you think China's developers are late, but now they have caught up?Yes. Judging from the companies, although Chinese developers have been lagging behind for some time, they have now caught up and are technically in sy

-to-many, a-to-many, or many-to-many. This is the relationship between classes. Identifies the field of the table. An object of course has numerous attributes (such as: height, weight, gender, age, name, ID number, driver's license number, bank card number, passport number, Hong Kong-Macau pass number, work number, medical history, married etc), we write the program need to record only the attributes we care about. The attributes of these concerns are the fields of the table, that is, the pr

In life, "lazy" is often ridiculed, "lazy" is not popular. and persuade people diligent quotes but countless, what "diligence, desolate in the hippie", "the book Mountain has no Royal road as the path, the study of the endless bitter for boat", "shift lights just before dawn chicken, is the man reading", more "head cantilever, Cone Thorn shares" and so on. People are proud of their diligence and anguish. But when I finished reading the second chapter of "The Boulevard to Jane", I had a new under

notebook computer, the handset is no exception. and professional cloud service providers have a large number of security experts, put the data on the cloud, is entrusted to professional security companies.In fact, human attitudes to money have undergone a similar shift, and when banks have just invented it, no one believes that it is safer to put money in a bank than under its own pillow. But today's "safer banks" have become common sense, and we kno