Program to convert a number in to words

Input a number - 568
Output - Five Hundred Sixty Eight


import java.util.*;
class numtoword
{
public static void main(String arg[])
{
String a[]={"", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Ninteen"};
String b[]={"", "", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninty"};
Scanner ob=new Scanner(System.in);
int n,m,p,q,r;
System.out.println("Enter a number less than 1000");
n=ob.nextInt();
if(n<1000)
{
m=n/100;
p=n%100;
if(m>0) System.out.print(a[m] + " Hundred ");
else System.out.print("");
if(p<20) System.out.println(a[p]);
else
{
q=p%10;
r=p/10;
System.out.println(b[r] + " " + a[q]);
}
}
}
}