Write a Java program that generates an array of Fibonacci numbers. Add comments

Question

Write a Java program that generates an array of Fibonacci numbers. Add comments to the program.

Specifications:

1. Fills a one-dimensional array with the first 30 Fibonacci numbers using a calculation to generate the numbers. Note: it is not permissible to initialize the array explicitly with the Fibonacci series’ first 30 numbers!

2. Prints the Fibonacci numbers in the array

3. Prompts the user to input an (integer) number between 1 and 30 (inclusive) and prints in response to the user entry: The nth Fibonacci number is X, where n is the number input by the user and X is the Fibonacci number in the nth position. (Remember that array indexes for the elements of the array start at 0)

4. Checks that the user has not input a number lower than 1 or higher than 30

You can check if you have the right numbers here:

http://www.maths.surrey.ac.uk/hosted-sites/R.Knott/Fibonacci/fibtable.html

Explanation / Answer

Output:

Enter any number : 10

Fibonacci Series upto 10

1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89

import java.io.*;

import Java.until.*;

public class FibonacciSeries{

  public static void main(String[] args) {

  //number of elements to generate in a series

System.out.println(" Enter any number below 30 ");//User enter the number

Scanner s= new Scanner(System.in); // it is used to read the input

int f=s.nextInt(); // integer conversion

long[] series = new long[f];

  //create first 2 series elements

series[0] = 0;

series[1] = 1;

  //create the Fibonacci series and store it in an array

  for(int i=2; i <=f; i++){

series[i] = series[i-1] + series[i-2];

  }

  //print the Fibonacci series numbers

  System.out.println("Fibonacci Series upto " + f);

  for(int i=0; i<=f; i++){

  System.out.print(series[i] + " ");

  }

  } // end of class

} // end of main method

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