问题描述
在C和C++编程语言中，include语句中使用尖括号和使用引号有什么区别，如下?
In the C and C++ programming languages, what is the difference between using angle brackets and using quotes in an include statement, as follows?
#include <文件名> #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 <filename>，预处理器以与实现相关的方式搜索，通常在编译器/IDE 预先指定的搜索目录中.该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"，预处理器首先在与包含指令的文件相同的目录中搜索，然后按照用于#include <filename>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 搜索路径文档.