Some examples are presented to illustrate the usage of conditional compilation, libraries, pointers and other cool stuff that C allows one to do.
Each folder contains one different example. So, just enter the desired folder and look directly to the source code, which is fortunately with comments.
Use gcc file.c -o executable to generate an executable file in the
command-line interface. Then, just do ./executable.
Always observe the outputs in the compilation process, in case of any warning or even error.
The examples were tested in a Linux (Ubuntu distro 16.04.1, kernel 4.15.0-36-generic) with GCC version 5.4.0 20160609.
Enjoy ☕ !