converts normal intergs to ROMAN numerals written to showcase javaScript skills
- The rules of roman numerals:
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- There are six basic rules when it comes to roman numerals.
- Rule 1: The numerals:
- All roman numerals are written using a combination of base numerals and subtractive numerals.
- There are only seven base numerals which can be used to create any numeral sequence or number representation:
- Utilizing the base numerals, there are also six subtractive numerals which act as shortcuts to represent numerals which would otherwise require four or five individual numerals:
- I, V, X, L, C, D, M
- Rule 2: The calculation:
- The value of a roman numeral sequence is calculated by simply adding together the numerals, from left to right.
- For example, the number 1988 converted to roman numerals is MCMLXXXVIII which is calculated from left-to-right as:
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M+CM+L+X+X+X+V+I+I+I - Rule 3: Number limits:
- Any sequence of standard roman numerals can only represent numbers from 1 to 3999.
- There is no zero in roman numerals.
- Using bracket notation or vinculum notation we can write roman numerals from 4000 to 3999999.
- Rule 4: Sequencing:
- Roman numerals are written from left to right, and from highest to lowest (in terms of individual numeral value).
- A higher value numeral cannot appear after a lower value numeral (unless in the context of an individual subtractive numeral).
- Rule 5: Repetition:
- An individual numeral cannot appear more than three times consecutively in any sequence.
- If you find yourself with four same-value numerals consecutively, it can always be simplified by using a subtractive numeral in its place.
- A special case for this simplification rule is four M's. This exceeds the 3999 limit and would be invalid unless vinculum notation
- or bracket notation were adopted. Using bracket notation, four M's becomes (IV).
- Rule 6: Single use numerals:
- There are individual numerals which can only appear once in any sequence.
- All subtractive numerals can only appear once in any sequence.
- From the set of base numerals: V, L, and D should only appear once.
- The only caveat to this is when using another notation such as bracket notation.
- A single-use numeral can appear once within the brackets and once outside the brackets.
- For example, 5005 in bracket notation is (V)V.