Dice sum distribution

backgammon-distribution.rb

#!/usr/bin/env ruby

T = 50000
def n
  rand(6) + 1
end

def title(x)
  puts x
  puts "*" * x.length
end

def calculateDistribution
  x = {}
  x.default = 0
  z = x.dup

  T.times do
    a = n 
    b = n
    c = a + b
    [x, z].each do |h|
      h[a + b] += 1
    end

    x[a] += 1
    x[b] += 1 unless a == b
  end

  [x, z]
end

def drawDistr(d, t)
  title t
  total = d.values.reduce :+
  d.to_a.sort.each do |thrown, count|
    percentage = count.to_f / total * 100
    puts("%2i has been thrown %4i times accounting for %2.2f%%." % [thrown, count, percentage])
  end
end

title "Backgammon: two dice sum distribution"
puts
drawDistr calculateDistribution[0], "Distribution percentage with numbers divided."
puts
drawDistr calculateDistribution[1], "Distribution percentage without numbers divided."