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#!/usr/bin/env ruby
require 'optimist'
conf = Optimist::options do
banner "cma < <one number per line>"
opt :round, "Number of digits after decimal point.", :type => :int, :default => -1
end
cma = 0.0
i = 0
while line = STDIN.gets
x = line.to_f
cma = cma + ((x - cma)/(i+1))
i +=1
if conf[:round] >= 0
puts cma.round conf[:round]
else
puts cma
end
STDOUT.flush
end
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