c:\@Work\Perl>perl -wMstrict -le "use POSIX qw(floor); ;; print 'perl version ', $]; ;; my @PC1=(58,50,42,34,26,18,10,2, 60,52,44,36,28,20,12,4, 62,54,46,38,30,22,14,6, 64,56,48,40,32,24,16,8, 57,49,41,33,25,17, 9,1, 59,51,43,35,27,19,11,3, 61,53,45,37,29,21,13,5, 63,55,47,39,31,23,15,7); ;; my @parr=('0','M','0','A','0','I','0','L'); printf $parr[floor( $PC1[$_]/8 )] for (0..63); " perl version 5.014004 Use of uninitialized value in printf at -e line 1. L0I0A0M0L0I0A0M0L0I0A0M0L0I0A0ML0I0A0M0L0I0A0M0L0I0A0M0L0I0A0M0