Including header files using "" vs <>

原创于 2012-04-12 11:16:17 发布 · 504 阅读

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#header #compiler #search #file #include #system

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本文详细解释了C语言中预处理指令#include的不同用法。使用<header.h>时，编译器会在系统头文件目录中搜索指定的头文件；而使用header.h时，编译器会首先在当前目录下查找头文件，若未找到则继续在系统头文件目录中查找。文章通过示例说明了两种不同引用方式的区别。

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when using #include to include header files，

If using <header.h>, the compiler will search the header file in the system header folder.
If using "header.h", the compiler will search the header file in the current folder first; if not found, it will search the header file in the system header folder.
In A.cpp, if using #include <A.h>，the following error message will show “fatal error C1083: Cannot open include file: 'A.h': No such file or directory”。using #include "A.h" can resolve this issue.
In a word，<> can be replaced with "", but "" can not be replaced with <>.