#include <filename> 和有什么区别?和#include“文件名"?-C/C++问题

What is the difference between #include lt;filenamegt; and #include quot;filenamequot;?(#include lt;filenamegt; 和有什么区别?和#include“文件名?)

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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.

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