Scala function: Calculate the factorial of a number

Scala Function Exercise-1 with Solution

Write a Scala function to calculate the factorial of a given number.

Sample Solution:

Scala Code:

object FactorialCalculator {
  def factorial(n: Int): BigInt = {
    if (n == 0 || n == 1) {
      1
    } else {
      n * factorial(n - 1)
    }
  }

  def main(args: Array[String]): Unit = {
    val number = 4
    val result = factorial(number)
    println(s"The factorial of $number is: $result")
    val number1 = 10
    val result1 = factorial(number1)
    println(s"The factorial of $number1 is: $result1")
  }
}

Sample Output:

The factorial of 4 is: 24
The factorial of 10 is: 3628800

Explanation:

In the above exercise -

• The factorial method uses a recursive approach to calculate the factorial. If the input n is 0 or 1, the method returns 1. Otherwise, it recursively calls itself with the parameter n - 1 and multiplies it by n.
• The main method is also defined inside the FactorialCalculator object. It serves as the program's entry point.
• Inside the main method, there are two variables declared: number with a value of 4 and number1 with a value of 10.
• The factorial method is called with number and number1 as arguments, and the results are stored in the result and result1 variables, respectively.
• Finally, the program prints the factorial results using println statements, along with the corresponding numbers.

Scala Code Editor :

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