Dec2Any.java

public class Dec2Any {

    /*
    *   Program:    Dec2Any.java
    *   Purpose:    Convert decimal to any lower base
    *   Creator:    Chris Clarke
    *   Created:    04.04.2012
    */

    public static void main(String[] args) {
        if (args.length == 2) {
            int decimal = Integer.parseInt(args[0]);
            if (decimal < 0) {
                System.out.println("Error: number out of range");
                System.exit(0);
            }

            int base = Integer.parseInt(args[1]);
            if (base < 2 || base > 10) {
                System.out.println("Error: base out of range");
                System.exit(0);
            }

            System.out.println( toBase(decimal, base));
        } else {
            System.out.println("Use: \"java Dec2Any <decimal number> <base>\"");
        }
    }

    static String toBase(int num, int base) {
        String result = "";
        do {
            result = (num % base) + result;
            num = num / base;
        } while (num > 0);
        return result;
    }
}