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
[Please use "reply to all".]
waterloo wrote (on Sun, 5 Jul 2009 at 10:13 +0800):
This is explained at the end of the section:
> 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 .
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.