Write a program in Java to input the values of x and n and print the sum of the following series:

S = 1 - x²/2! + x⁴/4! - x⁶/6! + ……. xⁿ/n!

import java.util.Scanner;

public class KboatSeries
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter x: ");
        int x = in.nextInt();
        System.out.print("Enter n: ");
        int n = in.nextInt();
        
        if (n % 2 != 0) {
            System.out.println("n should be even");
            return;
        }
        
        double sum = 0;
        int a = 1;
        for (int i = 0; i <= n; i += 2) {
            long f = 1;
            for (int j = 1; j <= i; j++) {
                f *= j;
            }
            double t = Math.pow(x, i) / f * a;
            sum += t;
            a *= -1;
        }
        
        System.out.println("Sum = " + sum);
    }
}