The Perl debugger interface, to me, is too cluttered for this purpose, especially considering the -- what are they, ANSI control codes? -- formatting.

ANSI codes, yes, because it's using Term::ReadLine::Gnu and Term::ReadLine (on my system at least) - i think they look cool, myself. (:

of course, if you want an interactive calculator, the Term::Readline manual has a nice example.

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strfry()