Programming a GUI with Xubuntu

[Liminalitus]

Hello all. I'm a bit of a (super) newbie when it comes to Xubuntu, and this seems like a great site to ask questions. My question is this: If I want to go about writing a GUI for a program in Xubuntu, how would I do that, and would it work on all other Ubuntu OS's? And can I use C++? Sorry if my English is bad.

[Linteg]

XFCE and Gnome both use the GTK+-toolkit. If you want to develop GUI apps with C++ I'd recommend using gtkmm (which is a C++ interface for GTK). The development package required should be available as libgtkmm2.4-dev, you'll also need g++ (GNU's C++ compiler) and pkg-config, they're all available in Xubuntu's repositories so install them with Synaptic (or Add/Remove Software).
gtkmm documentation is available at http://www.gtkmm.org/documentation.shtml.

[Liminalitus]

Ah. That helps me very much. Thank you, friend.