roman.py

#-------------------------------------------------------------------------------
# Name:        module1
# Purpose:
#
# Author:      Aravinthan
#
# Created:     09/02/2018
# Copyright:   (c) Aravinthan 2018
# Licence:     <your licence>
#-------------------------------------------------------------------------------
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)):


        s1 = value(str[i])

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


            s2 = value(str[i+1])


            if (s1 >= s2):


                res = res + s1
                i = i + 1
            else:


                res = res + s2 - s1
                i = i + 2
        else:
            res = res + s1
            i = i + 1

    return res


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