use strict;
use warnings;

my $d = 0.4444444444444446;
printf "%a\n", $d;
print "$d\n";

print "print() has rounded upwards\n"
  if "$d" > $d;

__END__
Outputs:
0x1.c71c71c71c71fp-2
0.444444444444445
print() has rounded upwards