Scala control flow Program: Find a factorial with a while loop

Scala Control Flow Exercise-4 with Solution

Write a Scala program to find the factorial of a given number using a while loop.

Sample Solution:

Scala Code:

object FactorialCalculator {
  def main(args: Array[String]): Unit = {
    val number: Int = 4 // Number for which you want to find the factorial

    var factorial: Long = 1 // Initialize the factorial variable as 1
    var i: Int = number

    while (i > 0) {
      factorial *= i
      i -= 1
    }

    println(s"The factorial of $number is: $factorial")
  }
}

Sample Output:

The factorial of 4 is: 24

Explanation:

In the above exercise -

• First we define a variable "number" and assign it a value (5 in this case) for which we want to find the factorial. We initialize a variable factorial as 1 since the factorial of 0 is defined as 1. We also initialize a variable i with the value of "number".
• Inside the while loop, we multiply the current factorial value with i and store the result back in factorial. Then, we decrement the value of i by 1.
• The loop continues until i becomes 0. When the loop finishes, we print the result using println, which displays the factorial.

Scala Code Editor :

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