#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Flow.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Input.H>
#include <FL/Fl_Box.H>
int main()
{
Fl_Double_Window win(640, 480);
Fl_Flow* flow = new Fl_Flow(0, 0, win.w(), win.h());
Fl_Button button(0, 0, 100, 30, "Button");
Fl_Input text(0, 0, 150, 30);
Fl_Box sep(0, 0, 10, 1
);
sep.color(FL_BLACK);
sep.box(FL_FLAT_BOX);
win.resizable(flow);
win.show();
return Fl::run();
}