Fibonacci in Scala

Welcome to the Fibonacci in Scala page! Here, you’ll find the source code for this program as well as a description of how the program works.

Current Solution

import javax.xml.bind.ValidationException

object TestClass {

  def fibonacci_rec(n: Int): Int = {
    if (n < 0) {
      // If invalid input throw an exception
      throw new ValidationException("Index should be positive")

    } else if (n == 1 || n == 2) {
      // Recursion anchors

      return 1

    } else {
      // Definition of Fibonacci sequence (sum of two previous numbers in the sequence)

      return fibonacci_rec(n - 1) + fibonacci_rec(n - 2)
    }

  }


  def main(args: Array[String]): Unit = {
    // Takes the first argument and uses it as index
    if (args.length == 0) {
      println("Please enter an index as an argument")
    }
    val index = args(0).toInt
    println(fibonacci_rec(index))
  }
}

Fibonacci in Scala was written by:

• paul-you

If you see anything you’d like to change or update, please consider contributing.

Note: The solution shown above is the current solution in the Sample Programs repository as of Oct 27 2019 19:46:35. The solution was first committed on Oct 25 2019 15:33:55. As a result, documentation below may be outdated.

How to Implement the Solution

No ‘How to Implement the Solution’ section available. Please consider contributing.

How to Run the Solution

No ‘How to Run the Solution’ section available. Please consider contributing.