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    \$\begingroup\$ Neither \x01 nor \xFF are printable characters. I guess that wasn't a requirement, though :-/ \$\endgroup\$ Commented Nov 9, 2013 at 5:37
  • \$\begingroup\$ A way to make it output printable characters would be to replace the + with , It does mean it requires an input though \$\endgroup\$ Commented Oct 3, 2018 at 23:01