public class Fibonacci {
        public static void main(String args[]) {
            // Declare variables
            int index = 0, first = 0, second = 1;

            System.out.println("Fibonacci Sequence");
            System.out.println();

            // Using a WHILE loop for this program.
            while (index < 21) {
                int next = first + second;
                System.out.println("Fib " + index + " = " + second);
                first = second;
                second = next;
                index++;
            } // end while
       } // end main
} // end class