sim kasper's dice problem

dnd.rb

def get_trial(dice_sides=6, explode_on=6)
  total = 0

  while true
    roll = rand(dice_sides) + 1 # rand(x) is int in 0..(x-1)
    total += roll
    break if roll < explode_on
  end

  return total
end



trials = []
(0..999999).each do
  trials << get_trial(dice_sides=6, explode_on=5)
end

avg = trials.inject { |sum, trial| sum + trial }.to_f / trials.count
puts "Average over #{trials.count} trials was #{avg}"