Iterative Constructs in Java

import java.util.Scanner;
 
public class FactorialSeriesSum
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter x: ");
        int x = in.nextInt();
        double sum = 0;
       
        for (int i = 2; i <= 20; i++) {
            double f = 1;
            for (int j = 1; j <= i; j++) {
                f *= j;
            }
            sum += x / f;
        }
        System.out.println("Sum = " + sum);
       
    }
}
 

import java.util.Scanner;
 
public class FactorialSeriesSum {
    // Method to calculate factorial of n
    public static long factorial(int n) {
        long fact = 1;
        for (int i = 2; i <= n; i++) {
            fact *= i;
        }
        return fact;
    }
 
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
 
        System.out.print("Enter the value of x: ");
        double x = sc.nextDouble();
 
        double sum = 0.0;
 
        for (int i = 2; i <= 20; i++) {
            sum +=  x / factorial(i) ;
        }
 
        System.out.println("Sum of the series is: " + sum);
 
        sc.close();
    }
}