学英语

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，长度不超过十位，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。

import java.util.Scanner;

public class Main {
    static     String[] dict=generate();
    public static void main(String[] args) throws Exception  
    {
        Scanner scanner=new Scanner(System.in);
        try {
            long x=scanner.nextLong();
            if(Long.toString(x).length()>10)
            {
                System.out.println("error");
                scanner.close();return;
            }
            System.out.println(parse(x));
        } catch (Exception e) {
            // TODO Auto-generated catch block
            System.out.println("error");
        }
        scanner.close();
    }
    
    public static String parse(long data)
    {
        StringBuilder stringBuilder=new StringBuilder();

        if(data>=1000000000)
        {
            int t=(int)(data/1000000000);
            stringBuilder.append(baiwei(t)+" billion ");
            data=data%1000000000;
        }
        if(data>=1000000)
        {
            int t=(int)(data/1000000);
            stringBuilder.append(baiwei(t)+" million ");
            data=data%1000000;
        }
        if(data>=1000)
        {
            int t=(int)(data/1000);
            stringBuilder.append(baiwei(t)+" thousand ");
            data=data%1000;                
        }
        if(data>0)
        {
            stringBuilder.append(baiwei((int)data));
        }
        
        return stringBuilder.toString();
    }
    
    public static String baiwei(int t)
    {
        if(t>100)
            return dict[t/100]+" hundred and "+dict[t%100];
        else if(t==100)
            return dict[1]+" hundred ";
        else
            return dict[t%100];
    }
    
    public static String[] generate()
    {
        String[] gewei={"zero","one", "two", "three", "four", "five", "six", "seven", "eight", "nine","ten"};
        String[] shiji={"eleven", "twelve", "thirteen", "forty","fifteen", "sixteen", "seventeen", "eighteen", "nineteen"};
        String[] shiwei={ "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"};
        String[] strings=new String[100];
        for(int i=1;i<=99;i++)
        {
            if(i<=10)
            {
                strings[i]=gewei[i];
            }
            else if(i>10 && i<20)
            {
                strings[i]=shiji[i-11];
            }
            else if(i>=20 && i<=99)
            {
                int s=i/10;
                int g=i%10;
                if(g>0)
                {
                    strings[i]=shiwei[s-2]+" "+gewei[g];
                }
                else 
                {
                    strings[i]=shiwei[s-2];
                }
            }
        }
        return strings;
    }
}