c++ - #include和有什么不一样 <filename> 和#include“文件名”？(What is the difference between #include <filename> and #include “filename”?)

Question

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

1. #include <filename>
2. #include "filename"

  ask by quest49 translate from so

Answer 1

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

(实际上，区别在于预处理器搜索包含文件的位置。)

For #include <filename> the preprocessor searches in an implementation dependent manner, normally in search directories pre-designated by the compiler/IDE.

(对于#include <filename> ，预处理器通常以实现依赖方式进行搜索，通常在编译器/ IDE预先指定的搜索目录中进行搜索。)

This method is normally used to include standard library header files.

(此方法通常用于包括标准库头文件。)

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.

(对于#include "filename" ，预处理器首先在与包含指令的文件相同的目录中搜索，然后遵循用于#include <filename>格式的搜索路径。)

This method is normally used to include programmer-defined header files.

(此方法通常用于包括程序员定义的头文件。)

A more complete description is available in the GCC documentation on search paths .

(有关搜索路径的GCC 文档中提供了更完整的描述。)