Write the program to find the sum of the following series:

S = a - a³ + a⁵ - a⁷ + ……. to n

import java.util.Scanner;

public class KboatSeries
{
    public void computeSeriesSum() {

        Scanner in = new Scanner(System.in);
        System.out.print("Enter a: ");
        int a = in.nextInt();
        System.out.print("Enter n: ");
        int n = in.nextInt();
        int sum = 0;

        for (int i = 1, j = 1; i <= n; i = i + 2, j++) {
            if (j % 2 == 0)
                sum -= Math.pow(a, i);
            else
                sum += Math.pow(a, i);
        }
        
        System.out.println("Sum=" + sum);
    }
}