Algorithm Roman Numeral Converter

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:checkered_flag: Problem Explanation:

You will create a program that converts an integer to a Roman Numeral.

:speech_balloon: Hint: 1

Creating two arrays, one with the Roman Numerals and one with the decimal equivalent for the new forms will be very helpful.

try to solve the problem now

:speech_balloon: Hint: 2

If you add the numbers to the arrays that go before the new letter is introduced, like values for 4, 9, and 40, it will save you plenty of code.

try to solve the problem now

:speech_balloon: Hint: 3

You can't have more than three consecutive Roman numerals together.

try to solve the problem now

Spoiler Alert!

Solution ahead!

:beginner: Basic Code Solution:

var convertToRoman = function(num) {

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

  var romanized = '';

  for (var index = 0; index < decimalValue.length; index++) {
    while (decimalValue[index] <= num) {
      romanized += romanNumeral[index];
      num -= decimalValue[index];
    }
  }

  return romanized;
}

// test here
convertToRoman(36);

:rocket: Run Code

Code Explanation:

• We start off by creating two arrays with default conversion with matching indices. These are called decimalValue and romanNumeral. We also create an empty string variable, romanized, which will house the final roman number.
• Using a for loop, we loop through the indicies of the decimalValue array. We continue to loop until while the value at the current index will fit into num.
• Next, we add the roman numeral and decrease num by the decimal equivalent.
• Finally, we return the value of romanized.

Relevant Links

• For Loops
• While Loops

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