FLTK Hello world

#include <FL/Fl.H>

#include <FL/Fl_Window.H>

#include <FL/Fl_Box.H>

int main (int argc, char ** argv)

{

  Fl_Window *window;

  Fl_Box *box;

  window = new Fl_Window (300, 180);

  box = new Fl_Box (20, 40, 260, 100, "Hello World!");

  box->box (FL_UP_BOX);

  box->labelsize (36);

  box->labelfont (FL_BOLD+FL_ITALIC);

  box->labeltype (FL_SHADOW_LABEL);

  window->end ();

  window->show (argc, argv);

  return(Fl::run());

}