What is the difference between #include "..." and #include ?

1.	What is the difference between #include "..." and #include ?
Answer» In practice, the difference is in the location where the preprocessor searches for the included file. For #include <filename> the C preprocessor LOOKS for the filename in the predefined list of system directories first and then to the directories told by the user(we can USE -I option to ADD directories to the mentioned predefined list). 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.

Answer»

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

For #include <filename> the C preprocessor LOOKS for the filename in the predefined list of system directories first and then to the directories told by the user(we can USE -I option to ADD directories to the mentioned predefined list).

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.

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