Even if you are an absolute beginner, this book will teach you all you need to know to write simple programs in C and start creating GUIs. The first half of the book is an introduction to C and covers the basics of writing simple command-line programs. The second half shows how to use the GTK user interface toolkit with C to create feature-rich GUI applications which can be run on the desktop. 156 pages of essential information: * Create simple command-line C programs * Control flow with conditions and loops * Handle variables, strings, and files * Design graphical user interface applications in C * Handle user input with buttons and menus * Use advanced UI features such as data stores and dialogues