C Libraries

The libraries are really useful because are libraries that contain many files with functions that we can use in our programs, like print, scan, verify is a digit, etc, that depends our program.

If we use them we don’t need to create or copy every function inside our programs, we only need to call the library that contain the functions that we need to use.

We are not obligated to use only the libraries that exists, we can create our own libraries.

The libraries have different extensions, the more common are: .lib, .bpl, .a, .dll and .h.

We don’t need to know how to works every function, the most important thing is know how to use them, if we know how to use we can call them in every moment.

There are two types of libraries:

Only are linked of phase of compilation, this mean that the exe file could be executed in either side, this works of this form because create a copy of every function that our program is using inside the exe file, the disadvantage is that the size of the file could be greater than dynamic library.

The extensions for static libraries are, “.lib” for windows and “.a” for linux.

Get the addresses of functions and add into the exe file, store the function in the memory, for this reason the dynamic libraries are smallest than static libraries.

The extensions for static libraries are, “.dll” for windows and “.so” for linux.

So, as second thing we can use the functions that contain the libraries that we include before, for example, if I have the function “isdigit()” inside my library I could use it in my program calling the function and sending the parameters, so we don’t need to copy the function inside our program because we have it inside the library that we include before.

We can create a static library in c using the command “ar”, this command have many flags that we can use depending that we need to do, for see more about those flags type “man ar”.

The first thing that you need to do is create the assemble code of all c files that you want to add to your library.

How you could see I use the flag “-r” and flag “-c”, the flag “-r” replace older object files, and the flag “-c” create a library if it doesn’t exists.

How to use them

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