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#include <gtk/gtk.h>

static void
hello (GtkWidget * widget, gpointer data)
{
  g_print ("Hello World!\n");
}

static gboolean
delete_event (GtkWidget * widget, GdkEvent * event, gpointer data)
{
  g_print ("delete event occurred\n");
  return TRUE;
}

static void
destroy (GtkWidget * widget, gpointer data)
{
  gtk_main_quit ();
}

int
main (int argc, char *argv[])
{
  GtkWidget *window;
  GtkWidget *button;

  gtk_init (&argc, &argv);
  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

  g_signal_connect (G_OBJECT (window), "delete_event",
                    G_CALLBACK (delete_event), NULL);
  g_signal_connect (G_OBJECT (window), "destroy", G_CALLBACK (destroy), NULL);

  gtk_container_set_border_width (GTK_CONTAINER (window), 10);
  button = gtk_button_new_with_label ("Hello World!");

  g_signal_connect (G_OBJECT (button), "clicked", G_CALLBACK (hello), NULL);
  g_signal_connect_swapped (G_OBJECT (button), "clicked",
                            G_CALLBACK (gtk_widget_destroy),
                            G_OBJECT (window));

  gtk_container_add (GTK_CONTAINER (window), button);
  gtk_widget_show (button);
  gtk_widget_show (window);

  gtk_main ();

  return 0;
}