Question

How to install new units (i mean includes ex: stdio.h) for my C, and how to download more?

Answer 1

put the header file on the same folder as your main source file,
ex:

/folder /–>main.c

    -->function.h
    -->function.c

then on main.c include it by writing :

  #include "function.h"

the quotes are used to include a header file that’s on the same folder as your c source file
u can also write your own and include them like above.