#include 指令：“test.h”与“test.h”之间的区别和“./test.h”
对于 C/C++ 预处理器，#include "./test.h" 和 #include "test.h" 之间有什么区别吗？
Is there any difference between #include "./test.h" and #include "test.h" for the C/C++ preprocessor?
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不，没有区别。
你也可以有
它会是一样的
No, there is no difference.
You could also have
And it would be the same
根据 C 标准，没有区别：编译器可以指定如何搜索它们。实际上，对于我所知道的任何实现来说，也不应该有任何差异。
According to the C standard, there is no difference: the compiler gets to specify how they are searched. In practice, there shouldn't be any difference, either, for any of the implementations I am aware of.
预处理器将同等对待这两种样式。标准做法是
将包含文件路径作为选项传递给编译器。 （例如，GCC 的 -I 选项）。这使得更改头文件的位置变得容易。您只需在项目的 make 文件中进行一次更改即可。
Both styles will be treated the same by the pre-processor. The standard practice is
and pass the include file path as an option to the compiler. (For instance, the -I option of GCC). This makes it easy to change the location of header files. You just need to make a single change in the project's make file.
我认为有一个重要的区别。
对于
#include "test.h"，将在使用选项 -I 为编译器指定的所有目录中搜索包含文件。在
#include "./test.h"的情况下，仅使用引用文件的驻留目录。In my opinion there is an important difference.
In the case of
#include "test.h"the include file is searched for in all directories specified to the compiler with the option -I.In the case of
#include "./test.h"only the residing directory of the referring file is used.