text: #include <gtk/gtk.h>
  
  static void
  print_hello (GtkWidget *widget,
               gpointer   data)
  {
    g_print ("Hello World\n");
  }
  
  int
  main (int   argc,
        char *argv[])
  {
    GtkBuilder *builder;
    GObject *window;
    GObject *button;
    GError *error = NULL;
  
    gtk_init (&argc, &argv);
  
    /* Construct a GtkBuilder instance and load our UI description */
    builder = gtk_builder_new ();
    if (gtk_builder_add_from_file (builder, "builder.ui", &error) == 0)
      {
        g_printerr ("Error loading file: %s\n", error->message);
        g_clear_error (&error);
        return 1;
      }
  
    /* Connect signal handlers to the constructed widgets. */
    window = gtk_builder_get_object (builder, "window");
    g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
  
    button = gtk_builder_get_object (builder, "button1");
    g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);
  
    button = gtk_builder_get_object (builder, "button2");
    g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);
  
    button = gtk_builder_get_object (builder, "quit");
    g_signal_connect (button, "clicked", G_CALLBACK (gtk_main_quit), NULL);
  
    gtk_main ();
  
    return 0;
  }
  