roman to integer code example

Example 1: Roman numerals to int python

class py_solution:
    def roman_to_int(self, s):
        rom_val = {'I': 1, 'V': 5, 'X': 10, 'L': 50, 'C': 100, 'D': 500, 'M': 1000}
        int_val = 0
        for i in range(len(s)):
            if i > 0 and rom_val[s[i]] > rom_val[s[i - 1]]:
                int_val += rom_val[s[i]] - 2 * rom_val[s[i - 1]]
            else:
                int_val += rom_val[s[i]]
        return int_val

print(py_solution().roman_to_int('MMMCMLXXXVI'))
print(py_solution().roman_to_int('MMMM'))
print(py_solution().roman_to_int('C'))

Example 2: integer to roman

function integer_to_roman(num) {
  if (typeof num !== "number") return false;

  var digits = String(+num).split("");

  key = [
    "",
    "C",
    "CC",
    "CCC",
    "CD",
    "D",
    "DC",
    "DCC",
    "DCCC",
    "CM",
    "",
    "X",
    "XX",
    "XXX",
    "XL",
    "L",
    "LX",
    "LXX",
    "LXXX",
    "XC",
    "",
    "I",
    "II",
    "III",
    "IV",
    "V",
    "VI",
    "VII",
    "VIII",
    "IX",
  ];

  roman_num = "";

  i = 3;

  while (i--) roman_num = (key[+digits.pop() + i * 10] || "") + roman_num;

  return Array(+digits.join("") + 1).join("M") + roman_num;
}

console.log(integer_to_roman(888666687));