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Today, I started to take notes based on the study of Linux C programming related videos. I hope I can stick to it.

1. The composition of the development environment

Editor: VI

Compiler: select GNU Candlestick + compiler gcc

Debugger: widely used gdb

Function library: glibc

System header file: glibc_header

2. Points for attention when installing Linux

You can install gcc/gdb automatically by selecting "Development tools" in "Program Development" during installation.

If you want to develop a graphical interface, you also need to choose GNOME/KDE software development.

3. IDE (integrated development environment: a tool that integrates editing, compilation, debugging and other functions)

Kylix: known as dephi under Linux

Kdevelop

RHIDE: similar to Turbo C++

4. Compiler: gcc (GNU CCompiler)

Is a multi-platform compiler launched by GNU. Here are the suffixes and interpretations of some source files supported by gcc.

C suffix c language source code file

The .h suffix is the header file contained in the program.

The .o suffix is the compiled object file

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Example: gcc-o hello hello.c

Note: 1. Gcc compiles our source program

2. The-o option requires that the executable file that the compiler outputs to us is called hello

3. Hello.c is our source program

4. Execute. / hello and you can see the output of the program.

Check the gcc version number:

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Gcc-version

5. Function library: glibc

Glibc is a C library that provides system access and calling functions, such as open,malloc,printf, etc.

View the version of glibc:

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Ls / lib/libc-*

6. System header file: glibc_header

In the absence of system header files, many c programs that use system functions will not be compiled.

If users install less of these packages during installation, they will not be able to compile the c source program. At this time, you can quickly install Linux's C development language environment through the rpm package.

7. C program development process under Linux:

(1) use vi tool to edit and write source program

(2) saved as * .c

(3) use gcc to compile to binary executable file

(4). / a.out execution (when gcc does not specify an executable file name with the-o option)

(5) if there is a problem, you can use gdb to debug.

8. The first program: Hello.c

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Int main (int args,char * * argv)

{

Printf ("Hello Linux\ n")

Return 0

}

9. C program composition

For a c program, the installation can be divided into three parts

Executable file; include file; library file

For example, the MySQL database installed with rpm:

(1) the executable file is placed under / usr/bin

(2) include files under / usr/include/mysql

(3) the library file is under / usr/lib/mysql

VMware tools is a tool that comes with virtual machine VMware Workstation. Its function is to enable users to drag files directly from the physical host to the virtual machine. If it is not installed, we will not be able to transfer files between the virtual machine and the physical machine. Here's how to install it all.

Whether you are using windows or linux, it is much more convenient to drag directly to windows when transferring files.

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Open the terminal:

Graphical interface: it is available in the right-click menu, if not, it can be opened in the application > attachment > terminal.

Command line: it can be said that the command line runs directly on the terminal without opening it.

Then log in with the root user

Install vmware-tools

After I have installed it, go to virtual machine > install vmare tolls option, and then a dialog box will pop up with this compressed file: VMwareTools-10.0.5-3228253.tar.gz

Copy the file to the / tmp file:

Under the tmp directory:

First extract the copied file: tar zxf VMwareTools-10.0.5-3228253.tar.gz

Then, go to the extracted folder / tmp/vmware-tools-distrib: cd / tmp/vmware-tools-distrib

Run. / vmware-install.pl

After it's installed, finally, restart it.

2010-10-29 11:40:23 + 0800

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Collection

Concat

Splice another object or array to an existing object or array

The basic ideas are as follows:

1) use JQ .getJSON () to read the JSON file, read the data read using .getJSON () to read the JSON file, read the data read using .getJSON () to read the JSON file, use .each () to loop through the data, and insert the option value as the current traversal value in the loop body.

2) the municipal level varies with the provincial level, and my approach is to read the JSON file again and use onchange () to monitor the changes in options.

3) match through KaTeX parse error: Expected 'EOF', got' #'at position 3: ("# matching province option.... (each) loop. If the match is successful, take out the" city "object in the JSON data, do another $. (each) traversal, and assemble the html code block (or insert it directly with append (), but in this case you must empty the corresponding html content at the beginning of the function).

4) insert the html code block assembled above into the html document using .html ().

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