No problemo :) The changes are documented in perldeltas, (http://perldoc.perl.org/index-history.html) like perl5100delta#say()

$ perl -E " say sprintf q{v%vd %f },  $^V, $] "
v5.16.1 5.016001
[download]

Grab yourself a copy of the free book Modern Perl a loose description of how experienced and effective Perl 5 programmers work....You can learn this too. , it also explains this