leetCode:Integer to Roman

题目

Given an integer, convert it to a roman numeral.

Input is guaranteed to be within the range from 1 to 3999.

题目分析

将阿拉伯数字转换为罗马数字。

思路

建立表格，将要求的数从大到小分解。

AC代码

public class Solution {
    public String intToRoman(int num){
        String string = "";
        String[] symbol = {"M","CM","D","CD","C","XC","L","XL","X","IX","V","IV","I"};
         int[] value= {1000,900,500,400, 100, 90,  50, 40,  10, 9,   5,  4,   1};

         for(int i = 0; num!=0; ++i){
             while (num >= value[i]) {
                 num-= value[i];
                 string+= symbol[i];
            }
         }
        return string;
    }
}