What is the difference between and “stdio.h”? [duplicate]

Answer 1

For the compilers I've used, "..." starts looking for the include file in the same directory as the source file that is being compiled, then the include path. Includes with <...> start in the include path, skipping the current die unless it is in the include path.

Answer 2

The second version is specified to search first in an implementation defined location, and afterwards if the file is not found, search in the same place as the <...> version, which searches in the paths usually specified by the -I command line option and by built-in include paths (pointing to the location of the standard library and system headers).

Usually, implementations define that location to be relative to the location of the including file.

Answer 3

I case of "..." compiler first search the header file in your local directory where your .c file presents

while in case of <...> compiler only search in header file folder

Answer 4

<stdio.h> searches in standard C library locations, whereas "stdio.h" searches in the current directory as well.

Ideally, you would use <...> for standard C libraries and "..." for libraries that you write and are present in the current directory.