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Asked: 2026-05-25T23:48:50+00:00

I found this ruby problem on RubyQuiz, which states besides the problem itself, the

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I found this ruby problem on RubyQuiz, which states besides the problem itself, the following:

“The script should be a standard Unix filter, reading from files
specified on the command-line or STDIN and writing to STDOUT. Each line of input will contain one integer (between 1 and 3999) expressed as an Arabic or Roman numeral”

I have no idea how to do a Unix Filter using Ruby.. to read files in this case,

Could somebody please enlighten me on how to accomplish this task in the best way possible.

Thanks as always!

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1 Answer

  1. Editorial Team

    The best way to read files from STDIN is using ARGF, as explained in this answer:
    Best practices with STDIN in Ruby?

    You can write to STDOUT using puts or printf.

    For more detailed info about IO in Ruby, read the Ruby Doc:
    http://www.ruby-doc.org/core/classes/IO.html

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