#!/usr/bin/ruby

# Translation of: https://rosettacode.org/wiki/Roman_numerals/Encode#ActionScript

func arabic2roman (num) {

    static lookup = [
        [ M => 1000],
        [CM =>  900],
        [ D =>  500],
        [CD =>  400],
        [ C =>  100],
        [XC =>   90],
        [ L =>   50],
        [XL =>   40],
        [ X =>   10],
        [IX =>    9],
        [ V =>    5],
        [IV =>    4],
        [ I =>    1],
    ];

    var roman = '';
    for (lookup) { |arr|
        var (r, a) = arr...;
        while (num >= a) {
            roman += r;
            num   -= a;
        }
    }

    return(roman);
}

#
## MAIN
#

[1990：:MCMXC, 2008：:MMVIII, 1666：:MDCLXVI].each { |pair|
    var roman = arabic2roman(pair[0]);
    roman == pair[1] || "Error occurred on number: #{pair[0]}\n".die;
    "%s in roman is %s".printlnf(pair[0], roman);
}