definition of x value

Exploring the operating principle and Startup Process of X Window System Xfree86 and startx started TWM for the first time in Debian. After gnome was installed, startx started the gnome environment. Why? What files were modified when gnome was

Value of Do{}while (0) When macro definition (#define) in C languageRecently found in the code of the new company everywhere used do{...} while (0), Google a bit, found that stack overflow early on a lot of discussion, summed up the discussion,

1 OverviewUsed preprocessing commands starting. For example, include the command # include and macro definition command # define. In the source program, these commands are placed outside the function, and are generally placed before the source file.

One.#define是C语言中提供的宏定义命令, the main purpose is to provide programmers with certain convenience in programming, and to a certain extent, improve the efficiency of the program, but students often do not understand the nature of the command in learning,

The Declaration tells the compiler some information to assist the compiler in syntax analysis and avoid compiler errors. The definition is to tell the compiler to generate some code that will be used by the connector. That is, the Declaration is for

When there is too much code in your code, it is especially inconvenient to read the code, and you need to use a newline character "\". Be aware of two points when using line breaks: The 1.c compiler is based on ";" To determine if it is a statement,

There are many places in the C language where macro definitions are used, such as in header files to prevent header files from being repeatedly included: #ifndef ctest_header_h #define CTEST_HEADER_H /header file content #endif Many macro

After the pain of transplanting jinja2 to Python3, I put the project aside for a while because I was afraid of breaking python3 compatibility. My approach is to use only one Python2 code base, and then translate the 2to3 tool into Python3 at

"Definition" and "declaration" of functions are not the same thing. The definition of function refers to the establishment of function function, including specifying function name, function value type, formal parameter and its type, function body,

Macro definition in C # define usage, # Define is a macro definition Command provided in C language. Its main purpose is to provide programmers with some convenience in programming and improve the program running efficiency to a certain extent,