Write a program to calculate the result of the formula pi in java 𝜋=4(1−1/3+1/5−1/7+1/9−1/11+1/13−⋯−1/2𝑖−1+1/2𝑖+1) with 10000 ≤ i ≤ 100000

Scanner sc = new Scanner(System.in);
        System.out.println("Enter the number");
        int n = sc.nextInt();
        double pi = 0;
        double sum = 0;
        for (int i = 0; i < n; i++) {
            if (i % 2 == 0) {
                pi = 4 / (2 * i + 1);
                sum = sum + pi;
            } else {
                pi = -4 / (2 * i + 1);
                sum = sum + pi;
            }
        }
        System.out.println(sum);