very definite include order, as follows: - include system headers - include application headers - include the header associated with this source file For example, in a file hello.c: #include <stdio.h> #include "utils.h" #include "hello.h" (Incidentally I think that a source file which ...
源文件包含 (#include) 当预处理器发现一个#include指令时,它会用指定的头文件或文件的全部内容来替换它。有两种方法可以使用#include。 #include <header 头文件> #include "file 文件" 第一种情况,在角括号<>之间指定一个头文件。这被用来包括由实现(implementation)提供的头文件,例如组成标准库的头文件(iostre...
The using translation unit uses the "canned" declarations in the header file by #include-ing it. There is no magic here; an include directive simply inserts the include file text as if it were written in the file directly. There is exactly zero difference. In particular, including a header...
#include叫做文件包含命令,用来引入对应的头文件(.h文件)。#include 也是C语言预处理命令的一种。#include 的处理过程很简单,就是将头文件的内容插入到该命令所在的位置,从而把头文件和当前源文件连接成一个源文件,这与复制粘贴的效果相同。#include 的用法有两种,如下所示:#include <stdHeader.h>#include ...
1.1 Order of Includes Include headers in the following order: Related header, C system headers, C++ standard library headers, other libraries' headers, your project's headers. For example, Inadsp/dirver/src/adsp_driver_adc.c, whose main purpose is to implement or test the stuff inadsp/dirver...
1, Header file duplicate reference: In order to avoid header file duplicate reference, we usually use macro definition in the header file to prevent duplicate inclusion. This way, when the header file is referenced multiple times, the compiler will only include the contents of the header file ...
include指令就是将头文件的全部内容原样复制到当前文件里,如果一个头文件被间接或直接的多次被“包含”到当前源文件,编译的时候必然报错。比如://code.c #include “myheader.h”#include “other.h”//other.h #include “nyheader.h”这是最简单的例子,在other.h里间接的重复包含了myheader.h文件的内容...
#include <stdio.h> // 包含系统头文件 #include "myheader.h" // 包含用户自定义头文件 使用头文件中的内容:一旦头文件被包含进来,就可以在源文件中使用其中声明的函数、定义的宏和类型等。这样,编译器就可以正确地识别和处理这些代码。四、头文件的注意事项 头文件保护:为了避免头文件被重复包含,可以...
I don't want to have to know all the dependencies of foo.h just to be able to use that header. I also despise having to include headers in a particular order. However, the developer of foo.h should also take responsibility for making it as dependency-free as possible. For example, ...
Syntax: #include <header file name> Example : #include <stdio.h> Main Function The main function, as the name suggests, is the most important function in every C or C++ program. It is an entry point or starting point of program execution. C compilers only recognize “main()” function ...