spinbutton example

[le a <l_armeanu yahoo co nz>]

Hi all,
 
I am trying to understand the spinbutton example from http://library.gnome.org/devel/gtk-tutorial/stable/x969.html
 
What is suppose the gtk_spin_button_set_snap_to_tick() function to do? Does it toggle between 0.5 and 0.1 (the min value where "digits" is 2)? Is the example given wrong (specially the toggle_snap function)?
 
Thanks,
Lee
(Sorry if I'm not posting in the right place.)