calculate_pi.rb

# frozen_string_literal: true

# Calculo do PI (Leibniz) em Ruby
# Carlos Alves
# https://github.com/EuCarlos

def calculate_pi(number)
  denominator = 1.0
  operation = 1.0
  pi = 0

  (1..number).each do |_count|
    pi += operation * (4.0 / denominator)
    denominator += 2.0
    operation *= -1.0
  end

  pi
end

def main
  terms = [10, 1000, 100_000, 10_000_000]

  terms.each do |term|
    puts "PI #{term}: #{calculate_pi(term)}"
  end
end

main