% perl -MConfig -le 'print +5.3130431399669280e-34; printf qq($_\n), +5.3130431399669280e-34 for qw/%.17f %.17e %.17g/; print qq($]\t|\t$Config{myuname})'
5.31304313996693e-34
0.00000000000000000
5.31304313996692843e-34
5.3130431399669284e-34
5.008005        |       linux builder4.centos.org 2.6.9-55.0.9.elsmp #1 smp thu sep 27 18:27:41 edt 2007 i686 i686 i386 gnulinux