Exercise Four-Two

public class NumberToWords {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        String input = args[0];
        String output = "";

        int index = 0;
        while(index < 3) {
            switch(input.charAt(index)) {
            case '1':
                output = output + "One ";
                break;
            case '2':
                output = output + "Two ";
                break;
            case '3':
                output = output + "Three ";
                break;
            case '4':
                output = output + "Four ";
                break;
            case '5':
                output = output + "Five ";
                break;
            case '6':
                output = output + "Six ";
                break;
            case '7':
                output = output + "Seven ";
                break;
            case '8':
                output = output + "Eight ";
                break;
            case '9':
                output = output + "Nine ";
                break;
            case '0':
                output = output + "Zero ";
                break;
            }

            index++;
        }

        System.out.println(output);
    }

}