Question

这是一个程序，要求用户输入有关宝石特性的信息，然后将其打印到屏幕上。诸如颜色，价格和名称之类的东西。我已经将它写成扩展，用户可以输入所有这些内容并打印出来。现在卡在了我应该循环播放的位置，并使用户可以输入任意数量的宝石。就像他/她输入3颗宝石一样，它应该循环播放并允许用户输入3种宝石类型的特征。我还想按字母顺序对宝石名称的结果输出进行排序。赞赏

enterprise distribution profile

Answer 1

首先不要将代码包装在class中。您的代码中没有OOP，因此也不需要该类。另外，gets返回一个字符串，而对于number，您可能需要一个整数。

这将是代码的[或多或少]红宝石版本：

print "How many gemstones do you want to enter? "
#                     ⇓⇓⇓⇓⇓ get rid of trailing CR/LF
#                           ⇓⇓⇓⇓ convert to integer
gemstoneNumber = gets.chomp.to_i

gemstones =
  1.upto(gemstoneNumber).map do |i|
    puts
    puts "Please enter data for the gemstone ##{i}:"

    print "What is the name of the gemstone? "
    name = gets.chomp # shave the trailing CR/LF off
    print "What is the color of the gemstone? "
    color = gets.chomp
    print "What is the price of the gemstone? "
    price = gets.chomp.to_f # convert to float

    # in Ruby we normally use hashes to store
    #   the named values
    {name: name, color: color, price: price}
  end

puts "You entered #{gemstoneNumber} gemstones. They are:"
gemstones.each do |gemstone|
  puts "Name: #{gemstone[:name]}. " \
       "Color: #{gemstone[:color]}. " \
       "Price: $#{gemstone[:price]}."
end

或者，您可以使用类而不是哈希来存储宝石信息。

按名称对宝石进行排序：

puts "You entered #{gemstoneNumber} gemstones. They are:"
#         ⇓⇓⇓⇓⇓⇓⇓ HERE
gemstones.sort_by { |gemstone| gemstone[:name] }.each do |gemstone|
  puts "Name: #{gemstone[:name]}. " \
       "Color: #{gemstone[:color]}. " \
       "Price: $#{gemstone[:price]}."
end

关于枚举的好的文档可以在官方的ruby文档中找到：https://ruby-doc.org/core/Enumerable.html#method-i-sort_by（及其周围）。

Answer 2

您也可以尝试。

def gem_stones num
  @gem_stones = []
  num.times do |a|
    print "Enter the name of gemstone #{a+1} "
    name=gets.chomp
    print "Enter the color of gemstone #{a+1} "
    color = gets.chomp
    print "Enter the price of gemstone #{a+1} "
    price = gets.chomp.to_f
    @gem_stones.push({name: name, color: color, price: price})
  end
  puts @gem_stones.sort_by {|a| a[:name]}.map{|gem| "Name: #{gem[:name]}, Color: #{gem[:color]}, Price: #{gem[:price]}"}.join("\n")
end

  puts "Ener the number of gem stones you want to enter?"
  num = gets.to_i
  gem_stones num

红宝石的排序和循环

2 个答案: