Scala program to find factorial of a number

1) Recursive Approach to find factorial of a number

In recursion, we will call the same method multiple times until a condition is not satisfied.

Here, we will call the function factorial(n) in the following way:

Program:

object myObject {

    def factorialRec(n: Int): Int ={
        if(n <= 1)
            return 1
        return n * factorialRec(n-1)
    }
    
    def main(args: Array[String]) {
        val n = 6
        println("The factorial of " + n + " is " + factorialRec(n))
    }
}

Output

The factorial of 6 is 720

2) Iterative approach to find factorial of a number

In iteration, we will loop over a sequence of numbers and multiply the number to result variable to find factorial.

Program:

object myObject {
    def factorialIt(n: Int): Int ={
       var factorial = 1
       for(i <- 1 to n)
            factorial *= i
        return factorial
    }
    
    def main(args: Array[String]) {
        val n = 6
        println("The factorial of " + n + " is " + factorialIt(n))
        
    }
}

Output

The factorial of 6 is 720