js convert Integer to Roman All In One

阿拉伯数字转罗马数字

freecodecamp

https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/roman-numeral-converter

"use strict";

/**
 *
 * @author xgqfrms
 * @license MIT
 * @copyright xgqfrms
 * @created 2022-03-09
 * @modified
 *
 * @description
 * @description
 * @difficulty Easy Medium Hard
 * @complexity O(n)
 * @time O(n)
 * @augments
 * @example
 * @link https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/roman-numeral-converter
 * @solutions
 *
 * @best_solutions
 *
 */

const log = console.log;

function convertToRoman(num) {
  // 进位，特殊处理
  const map = {
    M: 1000,
    CM: 900,
    D: 500,
    CD: 400,
    C: 100,
    XC: 90,
    L: 50,
    XL: 40,
    X: 10,
    IX: 9,
    V: 5,
    IV: 4,
    I: 1,
  };
  let result = '';
  for (let key in map) {
    // 向下取整
    const repeatCounter = Math.floor(num / map[key]);
    if (repeatCounter !== 0) {
      // 拼接罗马数字字符串
      result += key.repeat(repeatCounter);
    }
    // 获取余数
    num %= map[key];
    if (num === 0) {
      break;
      // return result;
    }
  }
  return result;
}

// convertToRoman(1984);
// 'MCMLXXXIV

convertToRoman(36);

 /*

(1) should return "I"
(2) should return "II"
(3) should return "III"
(4) should return "IV"
(5) should return "V"
(9) should return "IX"
10 X
(12) should return "XII"
(16) should return "XVI"

(500) should return "D"
(1000) should return "M"



例子：把 1984 转换为 罗马数字。
罗马 1984
把 1984 分成 1000、900、80 和 4，然后逐个转换

1000 = M
900 = CM
80 = LXXX
4 = IV
1000 + 900 + 80 + 4 = 1984，所以 1984 = MCMLXXXIV
 */

罗马数字

https://www.mathsisfun.com/roman-numerals.html

数学乐趣

https://www.shuxuele.com/roman-numerals.html

数学乐

https://www.mathopolis.com/questions/

12. Integer to Roman

Medium

https://leetcode.com/problems/integer-to-roman/

/**
 * @param {number} num
 * @return {string}
 */
var intToRoman = function(num) {
  // 进位，特殊处理
  const map = {
    M: 1000,
    CM: 900,
    D: 500,
    CD: 400,
    C: 100,
    XC: 90,
    L: 50,
    XL: 40,
    X: 10,
    IX: 9,
    V: 5,
    IV: 4,
    I: 1,
  };
  let result = '';
  for (let key in map) {
    // 向下取整
    const repeatCounter = Math.floor(num / map[key]);
    if (repeatCounter !== 0) {
      // 拼接罗马数字字符串
      result += key.repeat(repeatCounter);
    }
    // 获取余数
    num %= map[key];
    if (num === 0) {
       break;
      // return result;
    }
  }
  return result;
};

refs

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