# #include \#include This directive is used to include header files in your program. There are two ways to use it: ```cpp #include // For standard library headers #include "myheader.h" // For your own headers ``` ### difference between <> and "" while including a header ## For including header files using \`<>\` All header files, either available in standard/system or inside include folder of CPP project can be included using <> Even `` file is same as C's `` i.e. it appends `.h`, designers of CPP decided to not mark them with `` extension, maybe to differentiate CPP header files from C header file. ## For including header files using \`""\` This type of import we can used for module local header files, if a header file is only applicable to your project at a single place or just that folder, you can create a header file locally and import it as `#include` You can learn more about why we need header files in the first place here. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://notes.tejpratapsingh.com/_/cpp/code/pre-processors/include.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.