Here is one program that was born as a spin-off of Runner-QT. Meet CRunner: a program written with C++ and using Gtk+. The program is about 60 lines long and heavily commented -> you can easily follow the code.
/*CRunner v.1 Copyright (c) 2017 JJ Posti <techtimejourney.net>
#This program comes with ABSOLUTELY NO WARRANTY;
#for details see: http://www.gnu.org/copyleft/gpl.html.
#This is free software, and you are welcome to redistribute it under
#GPL Version 2, June 1991″)*/ Continue reading