>perl -le "for (my $i=0; $i<10; $i+=0.1) { print $i }" ... 8.79999999999998 8.89999999999998 8.99999999999998 9.09999999999998 9.19999999999998 9.29999999999998 9.39999999999998 9.49999999999998 9.59999999999998 9.69999999999998 9.79999999999998 9.89999999999998 9.99999999999998 >perl -le "for (0..99) { my $i = $_ / 10; print $i }" ... 8.8 8.9 9 9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.8 9.9