class Book

def add

@hh = {}

options = {}

print "Enter name: "

options[:name] = gets.strip

if options[:name] == ''

self.show_all

end

print "Enter age: "

options[:age] = gets.strip

@hh[options[:name]] = options[:age]

end

def show_all

@hh.each do |k,v|

puts "#{k} - #{v} years old"

end

end

end

a = Book.new

loop do

a.add

end