Roman Numerals Kata
The Romans wrote their numbers using letters; specifically:
- 'I' meaning '1',
- 'V' meaning '5',
- 'X' meaning '10',
- 'L' meaning '50',
- 'C' meaning '100',
- 'D' meaning '500',
- 'M' meaning '1000'.
There were certain rules that the numerals followed which should be observed:
- The symbols 'I', 'X', 'C', and 'M' can be repeated at most 3 times in a row.
- The symbols 'V', 'L', and 'D' can never be repeated.
- The '1' symbols ('I', 'X', and 'C') can only be subtracted from the 2 next highest values ('IV' and 'IX', 'XL' and 'XC', 'CD' and 'CM').
- Only one subtraction can be made per numeral ('XC' is allowed, 'XXC' is not).
- The '5' symbols ('V', 'L', and 'D') can never be subtracted.
Feature 1 - Converting Arabic to Roman
Convert from an Integer in the range [1, ..., 3999] into a String, representing a Roman numeral.
Feature 2 - Convertig Roman to Arabic
Convert from a String representing Roman numeral (i.e.: in the range [I, ..., MMMCMXCIX]) into the corresponding Integer value.
Suggested Approach
- Baby-step your way to an algorithm using TDD:
- Write a failing test and commit it.
- Implement such that the test is green and commit the solution.
- Refactor solution as desired as not to break the test
- Write next failing test case to implement against and commit.
Coding Dojo Format
- Navigator + Driver approach (5 minute timebox)
- Navigator becomes Driver after Driver performs a
git reset - New Navigator is chosen
- Last 5 minute timebox is retrospective