FXP Challange - Print Pi

package com.rexybaddog;

public class PiCalculation {
    public static void main(String[] args) {
        float piFloat = 4;
        double piDouble = 4;
        boolean plus = false;
        for (int i = 3; i < 100_000_000; i += 2) {
            if (plus) {
                piFloat += 4.0 / i;
                piDouble += 4.0 / i;
            } else {
                piFloat -= 4.0 / i;
                piDouble -= 4.0 / i;
            }
            plus = !plus;
            if ((i-1) % 1_000_000 == 0) {
                System.out.println("i: " + i + ", piFloat: " + piFloat);
                System.out.println("i: " + i + ", piDouble: " + piDouble);
            }
        }
        System.out.println("FINAL piFloat is: " + piFloat);
        System.out.println("FINAL piDouble is:  " + piDouble);
        System.out.println("Google search pi:  3.14159265359");
    }
}