Euler P17.java

public void p17() {
	long v = 0L;

	for (int i = 1; i  0) {
			int digit = (int)Character.digit(a.charAt(0), 10);

			if (digit == 0) {
				return "and" + toword(a.substring(1));
			}

			String ad = "";

			if (Integer.parseInt(a.substring(1)) > 0) {
				ad = "and";
			}

			return low[digit] + "hundred" + ad + toword(a.substring(1));
		}
	} else if (a.length() == 2) {

		if (Integer.parseInt(a) > 19) {
			int digit = (int)Character.digit(a.charAt(0), 10);

			if (digit == 0) {
				return "and" + toword(a.substring(1));
			}

			return tens[digit - 1] + toword(a.substring(1));

		} else if (Integer.parseInt(a) > 0) {

			return low[Integer.parseInt(a)];
		}
	} else if (a.length() == 1) {
		int digit = (int)Character.digit(a.charAt(0), 10);

		if (digit != 0) { 
			return low[digit]; 
		}
	}

	return "";
}