Integer to English Words

最新推荐文章于 2022-03-25 19:34:53 发布

原创最新推荐文章于 2022-03-25 19:34:53 发布 · 228 阅读

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本文介绍了一种将整数转换为英文表示的方法。通过定义不同的数值范围对应的英文词汇，如小于20的数字、小于100的数字及千、百万、十亿等单位，实现任意非负整数到英文字符串的转换。

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public class Solution {
    private final String[] less20 = {"", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"};
	private final String[] less100 = {"", "", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"};
	private final String[] more100 = {"", "Thousand", "Million", "Billion"};
    public String numberToWords(int num) {
        if (num == 0) {
            return "Zero";
        }
        String res = "";
        int i = 0;
        while (num > 0) {
            if (num % 1000 != 0) {
                res = helper(num%1000) + more100[i] + " " + res;
            }
            num = num/1000;
            i++;
        }
        return res.trim();
    }
    
    private String helper(int num) {
        if (num == 0) {
            return "";
        } else if (num < 20) {
            return less20[num] + " ";
        } else if (num < 100) {
            return less100[num/10] + " " + helper(num%10);
        } else {
            return less20[num/100] + " Hundred " + helper(num%100);
        }
    }
}