#include <gtk/gtk.h>gint release_resource(GtkWidget *widget,GdkEvent *event,gpointer data){	gtk_main_quit();	return 0;}int main(int argc,char * argv[]){	GtkWidget *wnd;	GtkWidget *box;	GtkWidget *btn;	gtk_init(&argc,&argv);	wnd=gtk_window_new(GTK_WINDOW_TOPLEVEL);	gtk_window_set_title(GTK_WINDOW(wnd),"Using HBox");	gtk_window_set_default_size(GTK_WINDOW(wnd),300,200);	gtk_container_set_border_width(GTK_CONTAINER(wnd),15);	box=gtk_hbox_new(TRUE,5);	gtk_container_add(GTK_CONTAINER(wnd),box);	btn=gtk_button_new_with_label("BUTTON ONE");	gtk_box_pack_start(GTK_BOX(box),btn,FALSE,TRUE,0);	btn=gtk_button_new_with_label("BUTTON TWO");	gtk_box_pack_start(GTK_BOX(box),btn,FALSE,TRUE,0);        btn=gtk_button_new_with_label("BUTTON THREE");        gtk_box_pack_start(GTK_BOX(box),btn,FALSE,TRUE,0);        g_signal_connect(G_OBJECT(wnd),"delete_event",G_CALLBACK(release_resource),NULL);	gtk_widget_show_all(wnd);		gtk_main();	return 0;}