using System;

namespace ConsoleApp
{
/// <summary>
/// 本类实现阿拉伯数字到大写中文的转换
/// 该类没有对非法数字进行判别
/// 请调用NumToChn方法
/// </summary>
public class NumFormat
{
  public NumFormat()
  {
   //
   // TODO: 在此处添加构造函数逻辑
   //
  }
  
  // 转换数字
  private char ToNum(char x)
  {
   string strChnNames="零一二三四五六七八九";
   string strNumNames="0123456789";
   return strChnNames[strNumNames.IndexOf(x)];
  }
  
  // 转换万以下整数
  private string ChangeInt(string x)
  {
   string strArrayLevelNames=new string {"","十","百","千"};
   string ret = "";
   int i;
   for (i=x.Length-1;i>=0;i--)
    if (x[i] == ''0'')
     ret = ToNum(x[i]) + ret;
    else
     ret = ToNum(x[i]) + strArrayLevelNames[x.Length-1-i] + ret;
   while ((i=ret.IndexOf("零零"))!=-1)
    ret=ret.Remove(i, 1);
   if (ret[ret.Length-1]==''零'' && ret.Length>1)
    ret=ret.Remove(ret.Length-1,1);
   if (ret.Length>=2 && ret.Substring(0,2)=="一十")
    ret=ret.Remove(0,1);
   return ret;
  }

  // 转换整数
  private string ToInt(string x)
  {
   int len = x.Length;
   string ret,temp;
   if (len<=4)
    ret = ChangeInt(x);
   else if (len<=8)
   {
    ret = ChangeInt(x.Substring(0,len-4)) + "万";
    temp = ChangeInt(x.Substring(len-4,4));
    if (temp.IndexOf("千")==-1 && temp!="")
     ret += "零" + temp;
    else
     ret += temp;
   }
   else
   {
    ret=ChangeInt(x.Substring(0,len-8)) + "亿";
    temp=ChangeInt(x.Substring(len-8,4));
    if (temp.IndexOf("千")==-1 && temp!="")
     ret += "零" + temp;
    else
     ret += temp;
    ret += "万";
    temp = ChangeInt(x.Substring(len-4,4));
    if (temp.IndexOf("千")==-1 && temp!="")
     ret += "零" + temp;
    else
     ret += temp;
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