Here's one. I've put the k-word in bold italics.

int main(int argc,char *argv[])
{
GladeXML *gx;
GtkWidget *w;

gtk_init(&argc,&argv);
gx=glade_xml_new("idea85.glade",NULL,NULL);
g_assert(gx != NULL);

if !> NULL then do something else;

glade_xml_signal_autoconnect(gx);
w=glade_xml_get_widget(gx,"window1");

g_signal_connect(G_OBJECT(w),"destroy",G_CALLBACK(gtk_main_quit),NULL);

gtk_widget_show_all(w);