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#!/usr/bin/ruby
#
# See ../README.md
#
#
# Run as: ruby ch-2.rb < input-file
#
w = [1, 3, 1, 7, 3, 9, 1]
ARGF . each_line do
| line |
line . strip!
if line . match (/^[0-9BCDFGHJKLMNPQRSTVWXYZ]{6}[0-9]$/) then
check = 0
line . split('') . each_with_index do
| char, i |
val = char . ord
if val <= "9" . ord then
val -= "0" . ord
else
val -= "A" . ord
end
check += w [i] * val
end
if check % 10 == 0 then
puts (1)
else
puts (0)
end
else
puts (0)
end
end
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