解题4（NumberToEnglish ）

题目描述

Jessi初学英语，为了快速读出一串数字，编写程序将数字转换成英文：

如22：twenty two，123：one hundred and twenty three。

说明：

数字为正整数，长度不超过九位，不考虑小数，转化结果为英文小写；

输出格式为twenty two；

非法数据请返回“error”；

关键字提示：and，billion，million，thousand，hundred。

方法原型：public static String parse(long num)

输入描述:

输入一个long型整数

输出描述:

输出相应的英文写法

示例1

输入

2356

输出

two thousand three hundred and fifty six

代码如下：

 package com.yzh.hehe;

 import java.util.Scanner;

 public class NumberToEnglish {

     public static void main(String[] args) {
         // TODO Auto-generated method stub
         Scanner scanner=new Scanner(System.in);
         while (scanner.hasNext()) {
             long num=scanner.nextLong();
             System.out.println(parse(num));
         }
         scanner.close();
     }

     public static String parse(long num){
         String[] geweiArr={"one","two","three","four","five","six","seven","eight","nine" };
         String[] shiweiArr={"twenty","thirty","forty","fifty","sixty","seventy","eighty","ninety"};
         String[] shiduoArr={"ten","eleven","twelve","thirteen","fourteen","fifteen","sixteen","seventeen","eighteen","nineteen"};
         String numString=String.valueOf(num);
 //        要求最多不超过九位数，不够九位的前面填0
         for (int i = numString.length(); i <9; i++) {
             numString="0"+numString;
         }
         StringBuilder stringBuilder=new StringBuilder();
         String million=numString.substring(0,3);//以1000（thousand）每三位为一个部分（个十百）来处理
         int miBaiInt=Integer.parseInt(million.substring(0, 1));
         boolean  flag=false;//判断是否加and的标志
         //处理三位组成的数当中的百位
         if (miBaiInt!=0) {
             flag=true;
             stringBuilder.append(geweiArr[miBaiInt-1]+" hundred");
         }
         int miShiInt=Integer.parseInt(million.substring(1,2));//三位组成的数当中的十位
         int migeInt=Integer.parseInt(million.substring(2));//三位组成的数当中的个位
         if ((miShiInt!=0||migeInt!=0)&&flag) {
             stringBuilder.append(" and ");
         }
         //十位为1时十位和个位可同时处理，否则，先处理十位，在处理个位
         if (miShiInt==1) {
             int temp=Integer.parseInt(million.substring(1));//十位个位同事处理
             stringBuilder.append(shiduoArr[temp-10]);
         }
         //十位，个位分别处理
         else {
              flag=false;
             if(miShiInt!=0){
                 flag=true;
                 stringBuilder.append(shiweiArr[miShiInt-2]);
             }
             if (flag&&migeInt!=0) {
                 stringBuilder.append(" "+geweiArr[migeInt-1]);
             }else if(migeInt!=0){
                 stringBuilder.append(geweiArr[migeInt-1]);
             }

         }
         int length=stringBuilder.length();//判断是否存在million和thousand
         if (length!=0) {
             stringBuilder.append(" million ");
         }
         String thousand=numString.substring(3,6);//处理第二个三位组成的部分
         int thBaiInt=Integer.parseInt(thousand.substring(0,1));
         flag=false;
         if (thBaiInt!=0) {
             flag=true;
             stringBuilder.append(geweiArr[thBaiInt-1]+" hundred");
         }
         int thShiInt=Integer.parseInt(thousand.substring(1,2));
         int thGeInt=Integer.parseInt(thousand.substring(2));
         if (flag&&(thShiInt!=0||thGeInt!=0)) {
             stringBuilder.append(" and ");
         }
         if (thShiInt==1) {
             int temp=Integer.parseInt(thousand.substring(1));
             stringBuilder.append(shiduoArr[temp-10]);
         }else {
             flag=false;
             if (thShiInt!=0) {
                 flag=true;
                 stringBuilder.append(shiweiArr[thShiInt-2]);
             }

             if (flag&&thGeInt!=0) {
                 stringBuilder.append(" "+geweiArr[thGeInt-1]);
             }else if (thGeInt!=0) {
                 stringBuilder.append(geweiArr[thGeInt-1]);
             }
         }

         if (stringBuilder.length()>length) {
             stringBuilder.append(" thousand ");
         }
         String bsg=numString.substring(6);//处理第三个三位组成的部分
         int bsgBaiInt=Integer.parseInt(bsg.substring(0,1));
         flag=false;
         if (bsgBaiInt!=0) {
             flag=true;
             stringBuilder.append(geweiArr[bsgBaiInt-1]+" hundred");
         }
         int bsgShiInt=Integer.parseInt(bsg.substring(1,2));
         int bsgGeInt=Integer.parseInt(bsg.substring(2));
         if (flag&&(bsgShiInt!=0||bsgGeInt!=0)) {
             stringBuilder.append(" and ");

         }
         if (bsgShiInt==1) {
             int temp=Integer.parseInt(bsg.substring(1));
             stringBuilder.append(shiduoArr[temp-10]);
         }else {
             flag=false;
             if (bsgShiInt!=0) {
                 flag=true;
                 stringBuilder.append(shiweiArr[bsgShiInt-2]);
             }
             if (flag&&(bsgGeInt!=0)) {
                 stringBuilder.append(" "+geweiArr[bsgGeInt-1]);
             }else if (bsgGeInt!=0) {
                 stringBuilder.append(geweiArr[bsgGeInt-1]);
             }
         }
         return stringBuilder.toString();

     }

 }