The function romanToInt () was expected to convert a valid Roman numeral string (e.g., "MCMXCIV") to its correct integer representation (1994) without any error or incorrect calculation.

# For example, 2 is written as II in Roman numeral, just two ones added together. 12 is written as XII, which is simply X + II. The number 27 is written as XXVII, which is XX + V + II. # Roman ...