Calculate 1 + 1!/X + 2!/X^2 + … + N!/X^N

/* Write a program that, for a given two integer numbers n and x,
 * calculates the sum S = 1 + 1!/x + 2!/x^2 + … + n!/x^n. Use only one loop.
 * Print the result with 5 digits after the decimal point. */

import java.util.Locale;
import java.util.Scanner;

public class _05_CalculateTheSumOfFractions {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Locale.setDefault(Locale.ROOT);
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter a whole positive number for N: ");
        int numN = scanner.nextInt();
        System.out.print("Enter other whole number for X: ");
        int numX = scanner.nextInt();
        scanner.close();

        if (numN > 0) {
            double sum = 1;
            double nominator = 1;
            double denominator = 1;
            for (int i = 1; i <= numN; i++) {
                nominator *= i;
                denominator *= numX;
                sum += nominator / denominator;
            }

            System.out.printf("The Sum of these Fractions is: %.5f!\n", sum);
        } else {
            System.out.println("Error! - Invalid Input number N!!!");
        }
    }

}