[CSC 204] Lab 7

[Andrew J. Pounds]

Several of you still seem to be struggling with Lab 7 and the BigInteger 
class.   Most of the problems I have seen have been the result of people 
not comparing things properly.   Here is my solution...


public class BiFactorial {

     public static void main(String[] args) {

         BigInteger value;  //  The value being computed
         Scanner in = new Scanner (System.in);  //  To allow for input

         //  Get the first value
         System.out.print("A value, please (use 0 to stop): ");
         value = BigInteger.valueOf(in.nextInt());

         while (!value.equals(BigInteger.valueOf(0))) {
             BigInteger result = fact(value);
             System.out.println(value + "! = " + result);
             System.out.print("A value, please (use 0 to stop): ");
             value = in.nextBigInteger();
         }
     }

     private static BigInteger fact(BigInteger n) {
         BigInteger product = BigInteger.ONE;
         for (int i = 2; (n.compareTo(BigInteger.valueOf(i)) >= 0); i++) {
             product = product.multiply(BigInteger.valueOf(i));
         }
         return product;
     }
}



-- 
Andrew J. Pounds, Ph.D.  (pounds_aj at mercer.edu)
Professor of Chemistry and Computer Science
Mercer University,  Macon, GA 31207   (478) 301-5627
http://faculty.mercer.edu/pounds_aj