Question

Create a dictionary having decimal equivalent of roman numerals. Store it in a binary file. Write a function to convert roman number to decimal equivalent using the binary file data.

Answer 1

import pickle

roman_values = {
    "I": 1, "V": 5, "X": 10, "L": 50,
    "C": 100, "D": 500, "M": 1000
}

with open("roman.dat", "wb") as file:
    pickle.dump(roman_values, file)


def roman_to_decimal(roman_number):
    with open("roman.dat", "rb") as file:
        values = pickle.load(file)

    roman_number = roman_number.upper()
    total = 0
    previous = 0

    for symbol in reversed(roman_number):
        value = values[symbol]
        if value < previous:
            total -= value
        else:
            total += value
            previous = value

    return total

print(roman_to_decimal("XIV"))

Output: 14. The subtraction rule handles numerals such as IV and IX.