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Roman Numerals Converter
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| #!/usr/bin/ruby | |
| class RomanNumerals | |
| ROMAN_VALUES = { | |
| '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 | |
| } | |
| def self.to_arabic_number roman | |
| result = 0 | |
| return result if roman.empty? | |
| roman.each_char.with_index do |char, index| | |
| char_number_value = ROMAN_VALUES[char] | |
| next_char_number_value = ROMAN_VALUES[roman[index+1]] | |
| (!next_char_number_value.nil? && char_number_value < next_char_number_value) ? result-= char_number_value : result += char_number_value | |
| end | |
| return result | |
| end | |
| def self.to_roman_numeral number | |
| result = '' | |
| return result if number == 0 | |
| ROMAN_VALUES.values.each do |divisor| | |
| if number >= divisor | |
| quotient, remainder = number.divmod(divisor) | |
| #debugger | |
| result += ROMAN_VALUES.key(divisor) * quotient | |
| number = remainder | |
| end | |
| end | |
| return result | |
| end | |
| end | |
| class IO | |
| def self.read file | |
| input_file = File.foreach(file) do |line| | |
| string_line_number = line.delete("\n") | |
| if string_line_number.match(/\AM{0,3}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})\z/) | |
| puts RomanNumerals.to_arabic_number string_line_number | |
| elsif line.to_i.between?(1,3999) | |
| puts RomanNumerals.to_roman_numeral string_line_number.to_i | |
| end | |
| end | |
| end | |
| end | |
| #IO.read "sample.txt" |
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