Scala program to find Factorial of a number
Given a number N, the task is to calculate factorial of N.
In mathematics, the factorial of a positive integer N is the product of all positive integers less than or equal to N. The recursive formula to calculate factorial of a given positive integer N is
N! = N * ( N -1 )! N! = 1 if N = 1 or N = 0
Examples:
Input : N = 3 Output : 6 Input : N = 5 Output : 120
Method 1 : Iterative Way
In this method, we will use a loop to iterate over the sequence of numbers to get the factorial.
Below is the implementation of above approach
Example :
// Scala Program to calculate // Factorial of a number // Creating object object GFG { // Iterative way to calculate // factorial def factorial(n: Int): Int = { var f = 1 for(i <- 1 to n) { f = f * i; } return f } // Driver Code def main(args: Array[String]) { println(factorial(5)) } } |
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Output :
120
Method 2 : Use of Recursion
In this method, Recursive formula N! = N * (N -1) ! is used to calculate the factorial of the given number.
Below is the implementation of above approach.
Example :
// Scala Program to calculate Factorial // of a number using recursion // Creating object object GFG { // Function to calculate // factorial using Recursive // formula (i.e N! = N * N-1 !) def factorial(n: Int): Int = { if (n == 0) return 1 else return n * factorial(n-1) } // Driver Code def main(args: Array[String]) { println(factorial(5)) } } |
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Output :
120
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