How to integrate multiple C programs into one.

There are various ways to integrate multiple C language programs together, depending on your needs and circumstances. Here are some commonly used methods:

1. Combine the code of multiple C language programs by copying and pasting them into one file: You can copy and paste the code of multiple C language programs into a new C source file, then compile and run it.
2. By using header files and function calls in C language: If you have multiple C programs, each with its own functions and variables, you can organize the declarations and definitions of these functions and variables in different header files and include them in a main program. Then, you can call these functions through function calls.
3. By using a Makefile, you can automate the process of compiling and linking multiple C language programs. A Makefile is a text file that contains commands for the compiler and linker, allowing you to compile and link multiple C source files as needed.
4. Using static or dynamic libraries: compile multiple C programs into static libraries (.a files) or dynamic libraries (.dll or .so files), and then link these libraries in other programs to use these programs.
5. Utilizing modular programming: dividing multiple C language programs into different modules, each responsible for a specific function. Then calling and interacting between these modules through interfaces. This approach can enhance the maintainability and reusability of the code.

Here are some commonly used methods for integrating multiple C language programs that you can choose according to your own needs.