整数转换英文表示

将非负整数转换为其对应的英文表示。可以保证给定输入小于 2³¹ - 1 。

示例 1:

输入: 123

输出: "One Hundred Twenty Three"

示例 2:

输入: 12345

输出: "Twelve Thousand Three Hundred Forty Five"

示例 3:

输入: 1234567

输出: "One Million Two Hundred Thirty Four Thousand Five Hundred Sixty Seven"

示例 4:

输入: 1234567891

输出: "One Billion Two Hundred Thirty Four Million Five Hundred Sixty Seven Thousand Eight Hundred Ninety One"

 class Solution {

     static String num1[]={"One","Two","Three","Four","Five","Six","Seven","Eight","Nine"};

     static String num2[]={"Ten","Eleven","Twelve","Thirteen","Fourteen","Fifteen","Sixteen","Seventeen","Eighteen","Nineteen"};

     static String tens[]={"Twenty","Thirty","Forty","Fifty","Sixty","Seventy","Eighty","Ninety"};

     public String numberToWords(int num) {

         if(num==0){

             return "Zero";

         }

         String result="";

         if(num>999999999){

             result+=numberToWordsWithThreeDIgit(num/1000000000)+" Billion";

             num%=1000000000;

         }

         if(num>999999){

             result+=numberToWordsWithThreeDIgit(num/1000000)+" Million";

             num%=1000000;

         }

         if(num>999){

             result+=numberToWordsWithThreeDIgit(num/1000)+" Thousand";

             num%=1000;

         }

         if(num>0){

             result+=numberToWordsWithThreeDIgit(num);

         }

         return result.trim();

     }

     public String numberToWordsWithThreeDIgit(int num){

         String result="";

         if(num>99){

             result+=" "+num1[num/100-1]+" Hundred";

         }

         num%=100;

         if(num>19){

             result+=" "+tens[num/10-2];

             num%=10;

         }else if(num>9){

             result+=" "+num2[num-10];

             num=0;

         }

         if(num>0){

             result+=" "+num1[num-1];

         }

         return result;

     }

 }




Leetcode 273.整数转换英文表示的相关教程结束。