Checkwriter for Number to Euros represenatation.

gistfile1.txt

public class CheckWriter {
	
	public static String BASIC_MONEYTARY_UNIT = " Euros";
	public static String MONEYTARY_UNIT = " cents";
	public static int MILLIONS = 1000000;
	public static int THOUSANDS = 1000;
	
	public static void main(String[] args) {
		
		System.out.println(numberToWords("999999.00"));
		System.out.println(numberToWords("22930.10"));
		System.out.println(numberToWords("1999.01"));
		System.out.println(numberToWords("199.20"));
		System.out.println(numberToWords("0"));
		System.out.println(numberToWords("10"));
		System.out.println(numberToWords("1200"));
		System.out.println(numberToWords("112.10"));
		System.out.println(numberToWords("874327.9"));
		System.out.println(numberToWords("978"));
		System.out.println(numberToWords("1.01"));
	}
	
	public static String numberToWords(String number) {
		
		int indexOfDecimalPoint = number.indexOf('.');
		int numberBeforeDecimalPoint;
		int numberAfterDecimalPoint;
		
		
		if(indexOfDecimalPoint != -1) {
			numberBeforeDecimalPoint = Integer.parseInt(number.substring(0, indexOfDecimalPoint));
		    numberAfterDecimalPoint = Integer.parseInt(number.substring(indexOfDecimalPoint+1, number.length()));
		} else {
			 numberBeforeDecimalPoint = Integer.parseInt(number);
			 numberAfterDecimalPoint = 0;
		}
		
		int million = numberBeforeDecimalPoint/MILLIONS;
		int thousand = (numberBeforeDecimalPoint - million * MILLIONS)/THOUSANDS;
		int rest = numberBeforeDecimalPoint - million * MILLIONS - thousand * THOUSANDS ;
		
		String euros = "";
		String cents = "";
		
		if(million != 0) {
			if(!euros.isEmpty()) 
				euros += " ";
			euros += three(million) + " Million";
		}
		
		if(thousand != 0) {
			if(!euros.isEmpty())
				euros+= " ";
			euros +=three(thousand) + " Thousand";
		}
		
		if(rest != 0) {
			if( !euros.isEmpty()) 
				euros+= " ";
			euros += three(rest);
		}
		
		if(numberAfterDecimalPoint != 0) {
			if(!cents.isEmpty())
				cents+= " ";
			cents += three(numberAfterDecimalPoint);
		}
		
		if(numberBeforeDecimalPoint == 0) {
			euros += "Zero";
		}
		
		if(numberAfterDecimalPoint == 0) {
			cents += "Zero";
		}
		
		return euros + BASIC_MONEYTARY_UNIT + " and " + cents + MONEYTARY_UNIT;
		
	}
	
	public static String one(int num) {
		switch(num) {
		   case 1: return "One";
		   case 2: return "Two";
		   case 3: return "Three";
		   case 4: return "Four";
		   case 5: return "Five";
		   case 6: return "Six";
		   case 7: return "Seven";
		   case 8: return "Eight";
		   case 9: return "Nine";		   
		}
		return "";
	}
	
	
	public static String twoLessThan20(int num) {
		switch(num) {
		   case 10: return "Ten";
		   case 11: return "Eleven";
		   case 12: return "Twelve";
		   case 13: return "Thirteen";
		   case 14: return "Fourteen";
		   case 15: return "Fifteen";
		   case 16: return "Sixteen";
		   case 17: return "Seventeen";
		   case 18: return "Eighteen";	
		   case 19: return "Nineteen";
		}
		return "";
	}
	
	public static String ten(int num) {
		switch(num) {
			case 2: return "Twenty";
			case 3: return "Thirty";
			case 4: return "Forty";
			case 5: return "Fifty";
			case 6: return "Sixty";
			case 7: return "Seventy";
			case 8: return "Eighty";
			case 9: return "Ninety";		
		}
		return "";
	}
	
	public static String three(int num) {
	    int hundred = num / 100;
	    int rest = num - hundred * 100;
	    String res = "";
	    if (hundred*rest != 0)
	      res = one(hundred) + " Hundred " + two(rest);
	    else if ((hundred == 0) && (rest != 0))
	      res = two(rest);
	    else if ((hundred != 0) && (rest == 0))
	      res = one(hundred) + " Hundred";
	    return res;
	  }
	
	 public static String two(int num) {
		    if (num == 0)
		      return "";
		    else if (num < 10)
		      return one(num);
		    else if (num < 20)
		      return twoLessThan20(num);
		    else {
		      int tenner = num / 10;
		      int rest = num - tenner * 10;
		      if (rest != 0)
		        return ten(tenner) + " " + one(rest);
		      else
		        return ten(tenner);
		    }
		  }
}