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From: Kevin Rodgers <ihs_4664@yahoo.com>
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Subject: Re: [elisp]How to ask and provide a Default value?
Date: Fri, 05 Mar 2004 11:16:38 -0700
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FKtPp@Office ;) wrote:
 > Kevin Rodgers <ihs_4664@yahoo.com> writes:
 >>(defun foo (number)
 >>   (interactive "nNumber: ")
 >>   (message "number=%d" number))
 >>
 >>When I type `M-x foo RET RET' on Emacs 19.34, I get an "End of file
 >>during parsing" error.  When I type that on Emacs 21.3, I get a
 >>transient "Please enter a number." Message, then the prompt is
 >>redisplayed.
 >
 > Thank you. I got it too :)
 >
 >>So evidently Emacs does not provide a default for the `n' character
 >>code.
 >
 > But, I still don't know how to use the default character description
 > :P Would u please give me a sample?

The `b' character code, which is used to return an existing buffer, does
provide a default (the current buffer):

(defun foo (buffer)
   (interactive "bBuffer: ")
   (message "buffer=%s" buffer))

-- 
Kevin Rodgers