Factorial_Total_Digit_Sum

package java20;

/**
 * Program to calculate the factorial of a given number.
 * Once implemented, it will calculate how many digits the answer includes.
 * It will then sum these digits together to provide a total.
 * @author shardy
 * date: 30/09/2012
 */

//import java.math.BigInteger;
public class Java20 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {

        //Using given number stored in factorialNo, calculates factorial
        //currently only works for numbers between 1! and 31! :(
            int fact= 1;
            int factorialNo = 10;

            for (int i = 1; i <= factorialNo; i++)
                {
                   fact=fact*i;
                }

            System.out.println("The factorial of " + factorialNo +
                    " (or " + factorialNo + "!) is: " + fact);

            //Using answer stored in fact, calculates how many digits the answer has
            final int answerNo = fact;
            final int digits = 1 + (int)Math.floor(Math.log10(answerNo));

            System.out.println("The number of digits in the factorials "
                    + "answer is: " + digits);

            //Using remainders, calculates each digits value and sums them together
            int number = fact;
            int reminder;
            int sum = 0;

            while(number>=1)
                {
                 reminder=number%10;
                 sum=sum+reminder;
                 number=number/10;
                }

            System.out.println("The total sum of all the " + digits
                    + " idividual digits from the answer of the factorial of "
                    + factorialNo + " is: " + sum);

    }
}