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#!/usr/bin/env ruby
require 'optimist'
conf = Optimist::options do
banner "avg < <one number per line>"
opt :round, "Number of digits after decimal point.", :type => :int, :default => -1, :short => "-r"
opt :Running, "Running average", :type => :bool, :default => false, :short => "-R"
end
def print_avg sum, i, round
avg = sum / i.to_f
if round >= 0
puts avg.round round
else
puts avg
end
end
sum = 0.0
i = 0
while line = STDIN.gets
sum += line.to_f
i +=1
if conf[:Running]
print_avg sum, i.to_f, conf[:round]
end
end
if not conf[:Running]
print_avg sum, i.to_f, conf[:round]
end
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