movies = {
	ruby: 4
  rails: 3
  }

puts "This is movie Hash, what do you want?"
puts "add? update? display? delete? "

choice = gets.chomp

case choice
when "add"
  puts "movie ? "
  title = gets.chomp.to_sym
  puts "rating ? "
  rating = gets.chomp.to_i

  if movies[title.to_sym] == nil

 		movies[title] = rating
	else
    puts "already exist"

  end

when "update"

  puts "what movie ? "
  title = gets.chomp.to_sym

  if movies[title.to_sym] == nil
  	puts "error try again"

  else
    puts "rating ? "
    rating = gets.chomp.to_i
    movies[title] = rating
  end


when "display"

  movies.each do |movie,rating|
    puts "#{movie}: #{rating}"

  end

when "delete"
  puts "what movie ? "
   title = gets.chomp.to_sym

  if movies[title.to_sym] == nil
  	puts "error try again"

  else
		movies.delete(title.to_sym)
    puts "removed successfuly"

  end


else
  puts "Error!"

end