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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	window = gtk_window_new (GTK_WINDOW_TOPLEVEL);	// Connect Window (to callbacks) (ie, close button on window decorations)	g_signal_connect (G_OBJECT (window), "delete_event", G_CALLBACK (delete_event), NULL);	g_signal_connect (G_OBJECT (window), "destroy",  G_CALLBACK (destroy), NULL);	// Container with window as parent	gtk_container_set_border_width (GTK_CONTAINER (window), 10);	// Button	button = gtk_button_new_with_label ("Hello World");	// Connect button (to callbacks)	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));	// Add button to container	gtk_container_add (GTK_CONTAINER (window), button);		// Show	gtk_widget_show (button);	gtk_widget_show (window);		gtk_main ();}