| |
| const TABLE: Array<[number, string]> = [ |
| [1000, 'M'], [900, 'CM'], [500, 'D'], [400, 'CD'], |
| [100, 'C'], [90, 'XC'], [50, 'L'], [40, 'XL'], |
| [10, 'X'], [9, 'IX'], [5, 'V'], [4, 'IV'], [1, 'I'], |
| ]; |
|
|
| export function toRoman(n: number): string { |
| if (!Number.isInteger(n) || n < 1 || n > 3999) { |
| throw new RangeError('1 ile 3999 arasında tam sayı olmalı'); |
| } |
| let out = ''; |
| let rest = n; |
| for (const [value, sym] of TABLE) { |
| while (rest >= value) { |
| out += sym; |
| rest -= value; |
| } |
| } |
| return out; |
| } |
|
|
| export function fromRoman(s: string): number { |
| const str = s.trim().toUpperCase(); |
| if (!/^[MDCLXVI]+$/.test(str)) throw new SyntaxError('Geçersiz Roma rakamı'); |
| const val: Record<string, number> = { M: 1000, D: 500, C: 100, L: 50, X: 10, V: 5, I: 1 }; |
| let total = 0; |
| for (let i = 0; i < str.length; i++) { |
| const cur = val[str[i]]; |
| const next = i + 1 < str.length ? val[str[i + 1]] : 0; |
| total += cur < next ? -cur : cur; |
| } |
| if (toRoman(total) !== str) throw new SyntaxError('Kanonik olmayan Roma rakamı'); |
| return total; |
| } |
|
|
