CalculatePi.java

public class CalculatePi {
  public static void main(String[] args) {
    int[] terms = {10, 1000, 100000, 10000000};

    for (int i = 0; i < terms.length; i++) {
      System.out.println("(" + terms[i] + "): " + leibniz_pi_calculation(terms[i]));
    }
  }

  public static double leibniz_pi_calculation(int number) {
    double denominador = 1.0;
    double operacao = 1.0;
    double pi = 0.0;

    for (int i = 0; i < number; i++) {
      pi += operacao * (4.0 / denominador);
      denominador += 2.0;
      operacao *= -1.0;
    }
    return pi;
  }
}