Reverse Roman Numerals
In this CheckiO mission
Roman Numerals you have to convert a decimal
number into its representation as a Roman number.
Here you have to do the same but the other way around.
You are given a Roman number as a string and your job is to convert this number into ...
| Numeral | Value |
|---|---|
| I | 1 (unus) |
| V | 5 (quinque) |
| X | 10 (decem) |
| L | 50 (quinquaginta) |
| C | 100 (centum) |
| D | 500 (quingenti) |
| M | 1,000 (mille) |
Input: A Roman number as a string.
Output: The decimal representation of the Roman number as an int.
Example:
reverse_roman('VI') == 6
reverse_roman('LXXVI') == 76
reverse_roman('CDXCIX') == 499
reverse_roman('MMMDCCCLXXXVIII') == 3888
Precondition:
len(roman_string) > 0
all(char in "MDCLXVI" for char in roman_string) == True
0 < reverse_roman(roman_string) < 4000
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