Python-Program-to-Convert-Roman-Numbers-to-Decimals/code.py at main · Cybercharm/Python-Program-to-Convert-Roman-Numbers-to-Decimals · GitHub

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# Python program to convert Roman Numerals
# to Numbers

# This function returns value of each Roman symbol


def value(r):
	if (r == 'I'):
		return 1
	if (r == 'V'):
		return 5
	if (r == 'X'):
		return 10
	if (r == 'L'):
		return 50
	if (r == 'C'):
		return 100
	if (r == 'D'):
		return 500
	if (r == 'M'):
		return 1000
	return -1


def romanToDecimal(str):
	res = 0
	i = 0

	while (i < len(str)):

		# Getting value of symbol s[i]
		s1 = value(str[i])

		if (i + 1 < len(str)):

			# Getting value of symbol s[i + 1]
			s2 = value(str[i + 1])

			# Comparing both values
			if (s1 >= s2):

				# Value of current symbol is greater
				# or equal to the next symbol
				res = res + s1
				i = i + 1
			else:

				# Value of current symbol is greater
				# or equal to the next symbol
				res = res + s2 - s1
				i = i + 2
		else:
			res = res + s1
			i = i + 1

	return res


# Driver code
print("Integer form of Roman Numeral is"),
print(romanToDecimal("MCMIV"))