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gouf/day_in_month.rb

Created August 16, 2019 15:39
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Paiza レベルアップ問題集: 「月の日数 Ruby編」 - https://paiza.jp/works/mondai/dateset/ruby/days_in_a_month
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day_in_month.rb
require 'date'
def count_day_in_month(date, month:, count: 0)
return count unless month.eql?(date.month)
count_day_in_month(date.succ, month: month, count: count + 1)
end
year, month, day = [*gets.chomp.split, 1].map(&:to_i)
puts count_day_in_month(Date.new(year, month, day), month: month)
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