The Towers of Hanoi as a Perl Extension (XS) written in C

http://www.kernelthread.com/projects/hanoi//html/perl-XS.html

This module tests the perl C API. Currently tests that printf works correctly

http://search.cpan.org/dist/perl/ext/XS/APItest/APItest.pm

from:http://www.webfakecall.com/john/?p=83