阿拉伯数字到罗马数字在线转换工具

这个在线阿拉伯数字到罗马数字转换工具可帮助您将一个阿拉伯数字转换为罗马数字. 输入阿拉伯数字, 罗马数字会显示在结果框中.

罗马数字用拉丁字母代表数字 ("I" 代表 "1", "V" 代表 "5", "X" 代表 "10", "L" 代表 "50", "C" 代表 "100", "D" 代表 "500", "M" 代表 "1000"). 罗马数字系统经常用在论文和书籍排序中.

1. 步骤1: 按顺序记住拉丁字母代表的数值 ["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].

2. 步骤2: 从左到右, 尝试减去最大的数值并重复,直到余0.

例1: 阿拉伯数字 "424" 转换为罗马数字:

例2: 阿拉伯数字 "2019" 转换为罗马数字:

维基百科 (罗马数字系统): https://en.wikipedia.org/wiki/Roman_numerals

def transform_number_to_roman_numeral(number):
    roman_value_list = [1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1]
    roman_char_list = ["M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"]
    res = ''
    for i in range(len(roman_value_list)):
        while number >= roman_value_list[i]:
            number -= roman_value_list[i]
            res += roman_char_list[i]
    return res


number_input = 987
roman_numeral_output = transform_number_to_roman_numeral(number_input)
print('number {0} equal to:{1}'.format(number_input, roman_numeral_output))

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number 987 equal to:CMLXXXVII

public class NumberConvertManager {
    public static String transform_number_to_roman_numeral(int number) {
        int[] roman_value_list = new int[]{1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
        String[] roman_char_list = new String[]{"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
        StringBuilder res = new StringBuilder();
        for (int i = 0; i < roman_value_list.length; i += 1) {
            while (number >= roman_value_list[i]){
                number -= roman_value_list[i];
                res.append(roman_char_list[i]);
            }
        }
        return res.toString();
    }

    public static void main(String[] args) {
        int number_input = 987;
        String roman_numeral_output = transform_number_to_roman_numeral(number_input);
        System.out.println("number " + number_input + " equal to:" + roman_numeral_output);
    }
}

-------------------
number 987 equal to:CMLXXXVII