Count the numbers in your code

numbers.rb

#!/usr/bin/env ruby
# Use with your code:
# $ grep -hIEro '\d+' . | ruby path/to/numbers.rb

tens = 0
fives = 0
twos = 0
evens = 0
odds = 0
count = 0

STDIN.each_line do |l|
  n = Integer(l.chomp.sub(/^0+([^0])/, '\1'))

  if n % 10 == 0
    tens += 1
  elsif n % 5 == 0
    fives += 1
  end

  if Math.log2(n) % 1 == 0
    twos += 1
  end

  if n % 2 == 0
    evens += 1
  else
    odds += 1
  end

  count += 1
end

puts "fives: #{fives}/#{count} = #{fives.to_f/count}"
puts "tens: #{tens}/#{count} = #{tens.to_f/count}"
puts "twos: #{twos}/#{count} = #{twos.to_f/count}"
puts "evens: #{evens}/#{count} = #{evens.to_f/count}"
puts "odds: #{odds}/#{count} = #{odds.to_f/count}"