BUILD PROBLEM

["green beret" <greenberet123 gmail com>]

i have just written a short program, the first one in the GTK tutorial in
gtk.org. I have given all the flags and it says compiled
successfully(geany). When i run the program it just returns to the shell
without doin anything.

i run it using ./gui
where gui is the executable the compiler has made

please tell me what i am doing wrong.