#include <filename> 和有什么区别?和#include“文件名"? [英] What is the difference between #include &lt;filename&gt; and #include &quot;filename&quot;?

问题描述

在 C 和 C++ 编程语言中，在 include 语句中使用尖括号和使用引号有什么区别，如下所示?

In the C and C++ programming languages, what is the difference between using angle brackets and using quotes in an include statement, as follows?

1. #include <文件名>
2. #include "文件名"

推荐答案

实际上，区别在于预处理器搜索包含文件的位置.

In practice, the difference is in the location where the preprocessor searches for the included file.

对于 #include ，预处理器以依赖于实现的方式搜索，通常在编译器/IDE 预先指定的搜索目录中.此方法通常用于包含标准库头文件.

For #include <filename> the preprocessor searches in an implementation dependent manner, normally in search directories pre-designated by the compiler/IDE. This method is normally used to include standard library header files.

对于 #include "filename"，预处理器首先在包含指令的文件所在的目录中搜索，然后按照用于 #include <的搜索路径进行搜索/代码> 形式.此方法通常用于包含程序员定义的头文件.

For #include "filename" the preprocessor searches first in the same directory as the file containing the directive, and then follows the search path used for the #include <filename> form. This method is normally used to include programmer-defined header files.

在 GCC 关于搜索路径的文档中提供了更完整的描述.

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