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From: kochhar@harvard.harvard.EDU (Sandeep)
Newsgroups: comp.lang.c
Subject: Recursive macros
Message-ID: <5896@husc6.harvard.edu>
Date: 6 Mar 91 18:15:30 GMT
Sender: news@husc6.harvard.edu
Reply-To: kochhar@harvard.harvard.EDU (Sandeep)
Distribution: usa
Organization: Aiken Computation Laboratory
Lines: 24

hi!
The man page for cpp on my sun 4 says that the -R flag allows
the definition of recursive macros.
I have two questions regarding this:

1. Can someone send me an example of how such a macro works, especially
how the termination condition works?

2. Can this be used to define a macro, say FOO(a, n) which works as:	
	FOO(a, 1) expands to 	a
	FOO(a, 2) expands to    a * a
	FOO(a, 3) expands to    a * a * a

	etc.

Reply by e-mail preferable, since I'm not a regular reader.
Thanks in advance for any help.

-- 

Sandeep Kochhar
Harvard University              email: kochhar@endor.harvard.edu
33 Oxford st,                   tel:   (617) 495-3988            
Cambridge, MA 02138             fax:   (617) 495-9837