Can one include command specify multiple included files?

An include command can only specify one included file. If there are multiple files to include, multiple include commands are required. File inclusions allow nesting, that is, an included file can contain another file.

include command usage

The general form of file inclusion command line is:

#include"文件名"

The function of the file include command (include) is to insert the specified file into the command line location to replace the command line, thereby connecting the specified file and the current source program file into one source file.

In programming, file inclusion is very useful. A large program can be divided into multiple modules and programmed separately by multiple programmers. Some common symbolic constants or macro definitions can be composed into a separate file, and the file can be used by including the file with the include command at the beginning of other files. In this way, you can avoid writing those common quantities at the beginning of each file, thereby saving time and reducing errors.

The following points should be explained about the include command:

1. The file name in the include command can be enclosed in double quotes, or Can be enclosed in angle brackets. For example, the following writing methods are allowed:

#include"stdio.h"
#include<stdio.h>

However, there is a difference between the two forms:

Use angle brackets to indicate searching in the include file directory (the include directory is set by the user environment) instead of searching in the source file directory. Using double quotation marks means first searching in the current source file directory, and if not found, then searching in the include directory. When programming, users can choose a certain command form according to the directory where their own files are located.

2. An include command can only specify one included file. If there are multiple files to be included, multiple include commands are required.

3. File inclusion allows nesting, that is, another file can be included in an included file.

Recommended: "c Language Tutorial"

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