NumberToWord.java

package rank;
import java.util.*;
public class NumberToWord
{
   private static String input;
   private static int num;
   private static String[] units=
   {"",
    " One",
    " Two",
    " Three",
    " Four",
    " Five",
    " Six",
    " Seven",
    " Eight",
    " Nine"
   };
   private static String[] teen=
  {" Ten",
   " Eleven",
   " Twelve",
   " Thirteen",
   " Fourteen",
   " Fifteen",
   " Sixteen",
   " Seventeen",
   " Eighteen",
   " Nineteen"
  };
  private static String[] tens=
 { " Twenty",
   " Thirty",
   " Forty",
   " Fifty",
   " Sixty",
   " Seventy",
   " Eighty",
   " Ninety"
 };
 private static String[] maxs=
{"",
 "",
 " Hundred",
 " Thousand",
 " Lakh",
 " Crore"
};

   
   public String convertNumberToWords(int n)
   {
       input=numToString(n);
       String converted=""; 
       int pos=1; 
       boolean hun=false;
       while(input.length()> 0)
       {
           if(pos==1) // TENS AND UNIT POSITION
           {   if(input.length()>= 2) // TWO DIGIT NUMBERS
               {   
                String temp=input.substring(input.length()-2,input.length());
                input=input.substring(0,input.length()-2);
                converted+=digits(temp);
               }
               else if(input.length()==1) // 1 DIGIT NUMBER
               {
                converted+=digits(input); 
                input="";
               }
               pos++;
           }
           else if(pos==2) // HUNDRED POSITION
           { 
               String temp=input.substring(input.length()-1,input.length());
               input=input.substring(0,input.length()-1);
               if(converted.length()> 0&&digits(temp)!="")
               {
                   converted=(digits(temp)+maxs[pos]+" and")+converted;
                   hun=true;
               }
               else
               {
                   if
                   (digits(temp)=="");
                   else
                   converted=(digits(temp)+maxs[pos])+converted;hun=true;
               }
               pos++;
           }
           else if(pos > 2) // REMAINING NUMBERS PAIRED BY TWO
           {
               if(input.length()>= 2) // EXTRACT 2 DIGITS
               {  
                String temp=input.substring(input.length()-2,input.length());
                input=input.substring(0,input.length()-2);
                  if(!hun&&converted.length()> 0)
                       converted=digits(temp)+maxs[pos]+" and"+converted;
                   else
                   {
                       if(digits(temp)=="")  ;
                       else
                       converted=digits(temp)+maxs[pos]+converted;
                   }
                }
                else if(input.length()==1) // EXTRACT 1 DIGIT
                {
                  if(!hun&&converted.length()> 0)
                   converted=digits(input)+maxs[pos]+" and"+converted;
                   else
                   {
                       if(digits(input)=="")  ;
                       else
                       converted=digits(input)+maxs[pos]+converted;
                       input="";
                   }
                }
                pos++; 
            }
       }
       return converted;
   }
   private String digits(String temp) // TO RETURN SELECTED NUMBERS IN WORDS
   {
       String converted="";
       for(int i=temp.length()-1;i >= 0;i--)
       {   int ch=temp.charAt(i)-48;
           if(i==0&&ch>1 && temp.length()> 1)
           converted=tens[ch-2]+converted; // IF TENS DIGIT STARTS WITH 2 OR MORE IT FALLS UNDER TENS
           else if(i==0&&ch==1&&temp.length()==2) // IF TENS DIGIT STARTS WITH 1 IT FALLS UNDER TEENS
           {
               int sum=0;
               for(int j=0;j < 2;j++)
               sum=(sum*10)+(temp.charAt(j)-48);
               return teen[sum-10];
           }
           else
           {
               if(ch > 0)
               converted=units[ch]+converted;
           } // IF SINGLE DIGIT PROVIDED
       }
       return converted;
   }
   private String numToString(int x) // CONVERT THE NUMBER TO STRING
   {
       String num="";
       while(x!=0)
       {
           num=((char)((x%10)+48))+num;
           x/=10;
       }
       return num;
   }
   private void inputNumber()
   {
       Scanner in=new Scanner(System.in);
       try
       {
         System.out.print("Please enter number to Convert into Words : ");
         num=in.nextInt();
       }
       catch(Exception e)
       {
        System.out.println("Number should be Less than 1 Arab ");
        System.exit(1);
       }
   }
   public static void main(String[] args)
   {
       NumberToWord obj=new NumberToWord();
       obj.inputNumber();
       System.out.println("input in Words : "+obj.convertNumberToWords(num));
   }
}