Integer to Roman

Given an integer, convert it to a roman numeral.

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

题目解析：数字转罗马字符，关于罗马字符跟数字之间关系请参照上一篇罗马字符与数字关系

算法分析：这里没有使用哈希表，主要是遍历使用起来不够方便，而是采用了整型和字符数组，见AC代码

public String intToRoman(int num) {
		if (num <= 0)
			return null;

		int[] nums = { 1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1 };
		String[] symbols = { "M", "CM", "D", "CD", "C", "XC", "L", "XL", "X",
				"IX", "V", "IV", "I" };
		StringBuilder sb = new StringBuilder();
		int i = 0;
		while (num > 0) {
			if (num / nums[i] == 0) {
				// 说明num量级不够
				i++;
				continue;
			}
			num -= nums[i];
			// 在字符串找到对应的字符
			sb.append(symbols[i]);
		}
		return sb.toString();

	}

Integer to Roman

原文：http://blog.csdn.net/xsf50717/article/details/47322167