Java application for Arabic-Roman and Roman-Arabic numeral conversion.
To launch the app simlpy download executable jar file - target/ArabicRomanConverter-1.3.jar.
Starting point is a rules reminder:
Input is case insensitive, trimmed from both ends:
In case of violation of rules or typo you'll get an error message:
Roman numerals are based on the following symbols:
| Symbol | Value |
|---|---|
| I | 1 |
| V | 5 |
| X | 10 |
| L | 50 |
| C | 100 |
| D | 500 |
| M | 1000 |
Only the digits I, X, C and M can be repeated up to three times.
Example:
| Legal | Illegal |
|---|---|
| MMM | CCCC |
| CCC | IIII |
| II | VV |
When a digit of lower value is written to the right or after a digit of higher value, then the values of all digits are added.
Example:
| CCXXX | C + C + X + X + X | 100 + 100 + 10 + 10 + 10 |
|---|---|---|
| MMXIII | M + M + X + I + I + I | 1000 + 1000 + 100 + 1 + 1 + 1 |
When a digit of lower value is written to the left or before a digit of higher value, then the value of the lower digit is subtracted from the value of the higher digit.
Example:
| XXIV | X + X + |I - V| | 10 + 10 + 4 |
|---|---|---|
| CMXLIX | |C - M| + |X - L| + |I - X| | 900 + 40 + 9 |