Note: you must use exceptions and try-catch blocks Example output:Enter the desired Fibonacci number n: 934Enter the desired Fibonacci number n: bobError: you must enter a numberEnter the desired Fibonacci number n: -2Error: -2 is not a positive number Directions:The Fibonacci series is a famous sequence of numbers that occurs often in nature, architecture, painting,etc. (you can more read about it on Wikipedia if you are interested). The sequence is defined as follows:• The first Fibonacci number is 1••The first few numbers in the sequence are therefore:1, 1, 2, 3, 5, 8, 13, 21, 34,Your task is to write a method called fibonacci that accepts an integer argument called n and returns thenth Fibonacci number. Because this method only makes sense for positive values of n, your methodshould throw an exception (which you will need to create) of type InvalidArgumentException. Yourmethod should have the following signature:public static int fibonacci(int n) throws InvalidArgumentExceptionHint: One way to implement the fibonacci method is to have two variables - one to keep track of theprevious fibonacci number and another to keep track of the one before the previous one. Then you canupdate these values inside a loop.You also need to create a class called Driver.java with a main method. In main:Prompt the user with the statement "Enter the desired Fibonacci number n: "Read in the user's response. If the user enters something that is not a number, catch the associatedexception and display the message "Error: you must enter a number" to standard error.The second Fibonacci number is also 1The nth Fibonacci number is the sum of the previous two numbers.If the user enters an integer, call the fibonacci method and display the result. If anInvalidArgumentException occurs, catch it from main and display the associated message to standarderror.

Answered: Example output: Enter the desired…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Note: you must use exceptions and try-catch blocks

Example output:
Enter the desired Fibonacci number n: 9
34
Enter the desired Fibonacci number n: bob
Error: you must enter a number
Enter the desired Fibonacci number n: -2
Error: -2 is not a positive number

Directions:
The Fibonacci series is a famous sequence of numbers that occurs often in nature, architecture, painting,
etc. (you can more read about it on Wikipedia if you are interested). The sequence is defined as follows:
• The first Fibonacci number is 1
•
•
The first few numbers in the sequence are therefore:
1, 1, 2, 3, 5, 8, 13, 21, 34,
Your task is to write a method called fibonacci that accepts an integer argument called n and returns the
nth Fibonacci number. Because this method only makes sense for positive values of n, your method
should throw an exception (which you will need to create) of type InvalidArgumentException. Your
method should have the following signature:
public static int fibonacci(int n) throws InvalidArgumentException
Hint: One way to implement the fibonacci method is to have two variables - one to keep track of the
previous fibonacci number and another to keep track of the one before the previous one. Then you can
update these values inside a loop.
You also need to create a class called Driver.java with a main method. In main:
Prompt the user with the statement "Enter the desired Fibonacci number n: "
Read in the user's response. If the user enters something that is not a number, catch the associated
exception and display the message "Error: you must enter a number" to standard error.
The second Fibonacci number is also 1
The nth Fibonacci number is the sum of the previous two numbers.
If the user enters an integer, call the fibonacci method and display the result. If an
InvalidArgumentException occurs, catch it from main and display the associated message to standard
error.

Expert Solution

Explanation

1) Below is Java program to read a number from user, validate it and display its Fibonacci number.

It imports scanner to read user inputs
In main method of program
- Create a scanner object to read user input
- Ask user to enter a number
- Validate the read number using try catch statement
  - Read integer
  - Check if number is positive
    - Call fibonacci function passing number n as parameter
    - Display the returned fibonacci number
  - Else display it is not a positive number
- On exception, display error message, Error. You must enter a number
Define method to that calculates the fibonacci number using recursive approach

2) Save program in Driver.java and run

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