Leetcode 12 Integer to Roman整数变罗马

题目：

Given an integer, convert it to a roman numeral.

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

翻译：

给一个整数，把他转换为罗马数字输出。

这道题是简单的字符转换的问题。只要了解罗马数字代表的含义即可。

罗马数字里面只有 1，5，10.  1到3之间用重复的1表示，4用IV 90用XC 依次类推。

I = 1;

V = 5;

X = 10;

L = 50;

C = 100;

D = 500;

M = 1000;

代码：

	public static String intToRoman(int num)
	{
		String str ="";
		String roman[]={"M","CM","D","CD","C","XC","L","XL","X","IX","V","IV","I"};
		int number[] = {1000,900,500,400,100,90,50,40,10,9,5,4,1};
		for(int i = 0 ;num!=0 ;i++)
		{
			while(num >= number[i])
			{
				num-=number[i];
				str+=roman[i];
			}
		}
		return str;
	}

这道题比较简单。只要了解罗马数字代表的 意思即可。