How to make an API out of a simple C function?

Follow these steps:


1) Code out a normal function in a C file, without any 'main' in it.


2) Make a library out of it


3) Code out a C file with 'main' function making a call to this function


4) Compile the C file with 'main' function using the library





The function that you wrote in the first C file is called an API coz with several other files contating their 'main' function you can use it, but with the help of a library consisting this function.