Usage of #include in C language

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The usage of #include in C language is: 1. Used to include header files of the standard library. The header files in the standard library are usually placed in the standard path of the system, and the compiler can directly find and include them; 2. Used to include user-defined header files. User-defined header files are usually placed in the current project directory or a specified path. For more related content, you can visit the articles under this topic.