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Computer basic knowledge and concept sharing

   Basic computer knowledge and concept sharing , Learning programming and mastering the basic knowledge of computer is the basic requirement , To understand how computers work 、 computer network 、 operating system 5、 Software Engineering 、 Design patterns 、 database 、 Data structure and algorithm 、 Compiling principles and other related contents , And learn something about it .

   Sharing computer basics :

   One 、 The concept of computer

  Computer, Full name electronic computer , Commonly known as computer . It's a program that can run , Automatically 、 Modern intelligent electronic equipment for high-speed processing of massive data . It consists of hardware and software .

   Two 、 The classification of computers

   The common form is desktop computers 、 Laptop computer 、 Big computers, etc .

   Hardware : It refers to a computer in which the electronic 、 A general term for various physical devices composed of mechanical and photoelectric elements . According to the requirements of the system structure, these physical devices form a whole and provide the material basis for the operation of computer software .

   The five components of computer hardware : Arithmetic unit 、 controller 、 Memory 、 Input devices and output devices .

   Arithmetic unit and controller are the core of computer , Collectively known as the central processing unit (Central Processing Unit,CPU) Or processor , That's what we often say CPU;

   Memory is used to store data , For example, memory. 、 Hard disk ;

   Input devices and output devices , It's used to show us information and operate computers . Common input devices , For example, mouse. 、 keyboard ; Common output devices , Like a display 、 Printers, etc .

   Software : A collection of computer data and instructions organized in a specific order

   Computer software is essential to the use of computers , Generally speaking , Computer software is to make the computer in accordance with the predetermined JI A specific function performed by support . Computer software is divided into system software and application software according to its function . Common system software , Yes DOS,Windows, Linux, Unix, Mac, Android,iOS. Common applications , Such as office software Pieces of .ffice, Chat software wechat 、QQ, Games etc. .

   3、 ... and 、 Computer language

   Computer language : A special language for communication between people and computers . It can communicate with computer through computer language .

   Classification of computer language : machine language , Assembly language and advanced language .

   machine language , It's a computer language expressed directly in binary code instructions , Instructions from . and 1 form , They have a certain number of digits , And divided into several sections , The code of each paragraph means different things .

   machine language : Reading and writing are cumbersome , It's very bad for development .

   assembly language : Use some special symbols instead of machine language binary code , Computers can't directly recognize , You need to use a software that will 〉 Assembly language translated into machine language . Compared to machine language ,

   Readability has been greatly improved , But the amount of coding is still very large .

   High-level language : The program is written in common English , What we have written is called source code , The source code is translated into machine language which can be recognized directly by computer through compiler , And then it's executed by the computer . There are many common high-level languages , Such as :C,C++,Java etc. .

   software development : The process of making software with the help of development tools and computer language

   Four 、 Computer function key

  Tab: tabs , Used to indent

  Shift: On Shift key

  Ctrl: Control key , Use with other keys

  Alt : change , Single use can call the window menu , Generally used with other keys

  space: Space bar , Enter a blank character , That is, the space

  Enter: Enter key , For line breaks

  Windows: windows Icon , Call out system menu

   5、 ... and 、 Shortcut keys are commonly used in computers

  Ctrl+A: Future generations

  Ctrl+C: Copy

  Ctrl+V : Paste

  Ctrl+X: shear

  Ctrl+Z: revoke

  Ctrl+S: preservation

   Typing speed requires minimum speed :150 word /min. english .

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