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What is the difference between #include and #include"filename"?

角括号EDOCX1 0和双引号EDOCX1？1的区别是什么，其中包括头文件在C++中？

我的意思是，哪些文件应该使用#include 来包含，哪些文件使用#include"MyFile.h"来包含？？？？

它依赖于编译器。也就是说，通常使用"将当前工作目录中的头文件优先于系统头文件。<>通常用于系统头段。从至规范(第6.10.2节)：

A preprocessing directive of the form

1	# include <h-char-sequence> new-line

searches a sequence of implementation-defined places for a header identified uniquely by the specified sequence between the < and > delimiters, and causes the replacement of that directive by the entire contents of the header. How the places are specified or the header identified is implementation-defined.

A preprocessing directive of the form

1	# include"q-char-sequence" new-line

causes the replacement of that directive by the entire contents of the source file identified by the specified sequence between the " delimiters. The named source file is searched for in an implementation-defined manner. If this search is not supported, or if the search fails, the directive is reprocessed as if it read

1	# include <h-char-sequence> new-line

with the identical contained sequence (including > characters, if any) from the original
directive.

因此，在大多数编译器中，使用""首先检查本地目录，如果找不到匹配项，则继续检查系统路径。使用<>以系统头开始搜索。

使用尖括号时，编译器将在包含路径列表中搜索文件。当使用双引号时，它首先搜索当前目录(即正在编译的模块所在的目录)，然后才搜索包含路径列表。

因此，按照惯例，您可以使用标准include的尖括号和其他所有内容的双引号。这样可以确保在(不推荐)情况下，如果您有一个与标准头同名的本地头，那么在每个情况下都会选择正确的头。