what does this code do and why cant i get it to run after i comppile it?

[John M]

include <gtk/gtk.h>

int main(int argc,char *argv[]){

GtkWidget *window ;

gtk_init(&argc,&argv) ;

window = gtk_window_new( GTK_WINDOW_TOPLEVEL ) ;

gtk_widget_show( window ) ;

gtk_main() ;

return 0 ;

}