FibonacciSeries.java

import java.util.Scanner;   // for user input

public class FibonacciSeries {

    /** Program:    FibonacciSeries.java
    *   Purpose:    Display the first n terms in the Fibonacci Series
    *   Creator:    Chris Clarke
    *   Created:    01.10.2012
    */

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n;

        System.out.println("I will compute the first n terms in the Fibonacci Series.");

        do {
            System.out.print("Please enter a value for n: ");
            n = scan.nextInt();
            if (n>40) System.out.println("Number too big! Must be 40 or less");
            if (n<1) System.out.println("Number too small! Must be 1 or more");
        } while (n>40 || n<1);

        for (int i=1; i<=n; i++) {
            System.out.print(fib(i)+" ");
        }
    }

    public static int fib(int n) {
        for (int i=1; i<=n; i++) {
            switch(i) {
                case 1 :
                case 2 :    F[i] = 1; break;
                default  :  F[i] = F[i-2] + F[i-1];
            }
        }
        return F[n];
    }

    private static int[] F = new int[41];
}