Converting Roman Numerals into Decimal Numbers using JavaScript Algorithm

Question

Converting Roman Numerals into Decimal Numbers using JavaScript Algorithm

I am eager to develop a Javascript Algorithm that can convert Roman numerals to Arabic using the provided methods below.

I have managed to find an algorithm that accomplishes this task successfully.

function convertToRoman(num) {

  var numeric = [ 5000,4000,1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1 ];
  var roman = [ 'V\u0305','I\u0305V\u0305','M', 'CM', 'D', 'CD', 'C', 'XC', 'L', 'XL', 'X', 'IX', 'V', 'IV', 'I' ];

  var output = '', i, len = numeric.length;

  for (i = 0; i < len; i++) {
    while (numeric[i] <= num) {
      output += roman[i];
      num -= numeric[i];
    }
  }

  return output;
}

convertToRoman(4999);

However, I am interested in learning how to implement an algorithm using the suggested methods above.

Thank you, and please be patient with me as I am still a beginner programmer.

javascript arrays algorithm

Answer 1

Answer №1

It seems like the question has already been addressed here:

Convert Number to Roman Numeral:

Number.prototype.toRoman= function () {
    var num = Math.floor(this), 
        val, romanNumeral= '', index= 0,
        values = [1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1], 
        numerals = ['M', 'CM', 'D', 'CD', 'C', 'XC', 'L', 'XL', 'X', 'IX', 'V', 'IV', 'I']; 

    function convertToBigRoman(n) {
        var result = '', remainder = n;

        while (remainder > 1000) {
            var prefix = '', suffix = '', number = remainder, str = '' + remainder, magnitude = 1;

            while (number > 1000) {
                number /= 1000;
                magnitude *= 1000;
                prefix += '(';
                suffix += ')';
            }
            
            var mainNumeral = Math.floor(number);
            remainder = str - (mainNumeral * magnitude);
            result += prefix + mainNumeral.toRoman() + suffix;
        }
        
        return result + remainder.toRoman();
    }

    if (this - num || num < 1) num = 0;
    if (num > 3999) return convertToBigRoman(num);

    while (num) {
        val = values[index];
        
        while (num >= val) {
            num -= val;
            romanNumeral += numerals[index];
        }
        
        ++index;
    }
    
    return romanNumeral;
};

Answer 2

It seems like the question has already been addressed here:

Convert Number to Roman Numeral:

Number.prototype.toRoman= function () {
    var num = Math.floor(this), 
        val, romanNumeral= '', index= 0,
        values = [1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1], 
        numerals = ['M', 'CM', 'D', 'CD', 'C', 'XC', 'L', 'XL', 'X', 'IX', 'V', 'IV', 'I']; 

    function convertToBigRoman(n) {
        var result = '', remainder = n;

        while (remainder > 1000) {
            var prefix = '', suffix = '', number = remainder, str = '' + remainder, magnitude = 1;

            while (number > 1000) {
                number /= 1000;
                magnitude *= 1000;
                prefix += '(';
                suffix += ')';
            }
            
            var mainNumeral = Math.floor(number);
            remainder = str - (mainNumeral * magnitude);
            result += prefix + mainNumeral.toRoman() + suffix;
        }
        
        return result + remainder.toRoman();
    }

    if (this - num || num < 1) num = 0;
    if (num > 3999) return convertToBigRoman(num);

    while (num) {
        val = values[index];
        
        while (num >= val) {
            num -= val;
            romanNumeral += numerals[index];
        }
        
        ++index;
    }
    
    return romanNumeral;
};

Converting Roman Numerals into Decimal Numbers using JavaScript Algorithm

Answer №1

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