Fix C Compilation Errors in Multiple Files

To resolve compilation errors in multiple files in C language, you can follow the steps below:

1. Check error messages: First, examine the error message provided by the compiler to understand the specific location and reason for the error.
2. Check the inclusion relationship between header files and source files: make sure each source file includes the necessary header files, and there are no duplicate inclusions in the header files.
3. Check the definition and declaration of variables and functions: make sure that the definition and declaration of variables and functions are consistent to avoid encountering undeclared errors or duplicate definition errors.
4. Check the compilation options: verify that all necessary source files are included in the compilation command and that the compilation options are set correctly.
5. Check dependencies: Make sure that the dependencies between files are correct if there are any in the program.
6. Manage compilation using Makefile: Using Makefile allows for easier management of compiling multiple files, ensuring correct order and dependencies.

By systematically troubleshooting errors through the above steps, it can help resolve compilation errors in C language with multiple files.