michael@0: # This Source Code Form is subject to the terms of the Mozilla Public
michael@0: # License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0: # file, You can obtain one at http://mozilla.org/MPL/2.0/.
michael@0: 
michael@0: =head1 NAME
michael@0: 
michael@0:  gcd - compute greatest common divisor of two integers
michael@0: 
michael@0: =head1 SYNOPSIS
michael@0: 
michael@0:  gcd <a> <b>
michael@0: 
michael@0: =head1 DESCRIPTION
michael@0: 
michael@0: The B<gcd> program computes the greatest common divisor of two
michael@0: arbitrary-precision integers I<a> and I<b>.  The result is written in
michael@0: standard decimal notation to the standard output.
michael@0: 
michael@0: If I<b> is zero, B<gcd> will print an error message and exit.
michael@0: 
michael@0: =head1 SEE ALSO
michael@0: 
michael@0: invmod(1), isprime(1), lap(1)
michael@0: 
michael@0: =head1 AUTHOR
michael@0: 
michael@0:  Michael J. Fromberger <sting@linguist.dartmouth.edu>
michael@0:  Thayer School of Engineering, Hanover, New Hampshire, USA