Convert between Roman numerals and standard numbers
Roman numerals are represented by combinations of letters from the Latin alphabet:
Numbers are formed by combining symbols and adding values, except when a smaller value appears before a larger one, in which case the smaller value is subtracted.
For example: IV = 4 (5-1) and IX = 9 (10-1)
Roman numerals can represent numbers from 1 to 3,999 in standard form.