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public ruby v1 · immutablerequire 'date'count = 0(1901..2000).each do |year| (1..12).each do |month| date = Date.civil(year, month, 1) count += 1 if date.cwday == 7 # 7 = Sunday endendputs countrequire 'date'count = 0(1901..2000).each do |year| (1..12).each do |month| date = Date.civil(year, month, 1) count += 1 if date.cwday == 7 # 7 = Sunday endendputs count