gistfile1.rb

class RouletteTable
  BLACk=[2,4,6,8,10,11,13,15,17,20,22,24,26,28,29,31,33,35]
  RED=[1,3,5,7,9,12,14,16,18,19,21,23,25,27,30,32,34,36]
  
  def self.spin
    result = rand(37)
    return :green if result == 0
    return :black if BLACk.include?(result)
    return :red if RED.include?(result)
  end
  
end

INITIAL_BANK=2000
BETTING_LIMIT=500
winnings=[]

1000.times do
  bank = INITIAL_BANK
  bet = 1
  
  100.times do
    break if (bank - bet) < 0
    bank -= bet
    if RouletteTable.spin == :black
      bank += bet*2
      bet = 1
      next
    end
    if bet <= BETTING_LIMIT
      bet = (bet*2.5).to_i
    else
      bet = 1
    end
  end
  winnings << bank - INITIAL_BANK
end

profit = winnings.select{|i| i > 0}.length
loss = winnings.select{|i| i < 0}.length
avg = winnings.inject{|acc,i| acc + i} / winnings.length
puts "Times Won: #{profit}" 
puts "Times Lost: #{loss}" 
puts "Average win amount: #{avg}"