Factorial using BigDecimal

FactorialWithBigDecimal.java

package org.thlim;

import java.math.BigDecimal;

/**
 *
 *
 * @author Lim, Teck Hooi
 *
 */
public class FactorialWithBigDecimal
{
    public static void main(String[] args)
    {
        BigDecimal initial = BigDecimal.valueOf(Integer.parseInt(args[0]));
        System.out.println(initial + "! = " + fac(initial, initial));
    }

    static BigDecimal fac(BigDecimal n, BigDecimal acc) {
        if (n.equals(BigDecimal.ONE)) {
            return acc;
        }
        BigDecimal lessOne = n.subtract(BigDecimal.ONE);
        return fac(lessOne, acc.multiply(lessOne));
    }
}