when test of while is nil , it does not run `print' following it.
who  does print nil ?

or  if all function will print its return value ?

thanks

2009/7/5 Glenn Morris <rgm@gnu.org>

>
> [Please use "reply to all".]
>
> waterloo wrote (on Sun, 5 Jul 2009 at 10:13 +0800):
>
> > yes,it is clearer . thanks
> >
> > In 11.1.2 An Example:`print-elements-of-list', I can not understand why
> > there is a `nil' in the context .
>
> This is explained at the end of the section:
>
>  Since the last expression in the function is the `while' loop, and
>  since `while' loops always return `nil', a `nil' is printed after the
>  last element of the list.
>