/**

* Write a program called Fibonacci to display the first 20 Fibonacci numbers F(n),

* where F(n) = F(n–1) + F(n–2) and F(1) = F(2) =1. Also compute their average.

*

* The output shall look like:

*

* The first 20 Fibonacci numbers are:

* 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 2584 4181 6765

* The average is 885.5

*/

package javaexercises.flowcontrol;

/**

*

* @author User

*/

public class Fibonacci {

public static void main(String[] args) {

Fibonacci aFibonacci = new Fibonacci();

aFibonacci.printFiboacciAndAverage(20);

}

private void printFiboacciAndAverage(int n) {

long fb1 = 1;

long fb2 = 1;

long fbn = 0;

long sum = 0;

if (n <= 0) {

System.out.println("Please correct number of items and try again.");

return;

}

System.out.println("The first " + n + " Fibonacci numbers are:");

for(int i = 1; i <= n; i++) {

switch (i) {

case 1: fbn = fb1; break;

case 2: fbn = fb2; break;

default:

fbn = fb1 + fb2;

fb1 = fb2;

fb2 = fbn;

}

sum += fbn;

System.out.print(fbn + " ");

}

System.out.println();

System.out.printf("The sum is %1$d \n", sum);

System.out.printf("The average is %.4f \n", (double)sum / n);

}

}