Question

下面是一个使用哈希显示菜单的方法。我无法弄清楚如何使用输入然后计算和显示用户选择的平衡。我也在努力学习类初始化的概念以及它在这方面有何帮助。任何帮助都非常欢迎！

def product_menu

  product_menu_hash = {
                        "Coffee"               =>  4.00,
                        "Soft Drink"           =>  4.00,
                        "Sandwich (Meat)"      =>  9.50,
                        "Sandwich (Veg)"       =>  8.00,
                        "Coffee Maker"         => 50.00,
                        "Bag of Coffee (250g)" => 13.25,
                      }

  puts "COFFEE SHOP"

  product_menu_hash.each_with_index do |(item, price), index|
    puts "#{index + 1} #{item} = $#{price}"
    input = gets.chomp
  end
end

Answer 1

如果用户输入项目数量为整数

tot = 0
 product_menu_hash = {
"Coffee" => 4.00,
"Soft Drink" => 4.00,
"Sandwich (Meat)" => 9.50,
"Sandwich (Veg)" => 8.00,
"Coffee Maker" => 50.00,
"Bag of Coffee (250g)" => 13.25,
  }

  puts "COFFEE SHOP"
  product_menu_hash.each_with_index do |(item,  price), index|

  puts "#{index + 1} #{item} = $#{price}"

  input = gets.chomp
  totpar = input.to_i * price
  puts totpar
  tot += totpar
end
puts 'total: ', tot

Answer 2

用户是店员，我想象他们只是进入了菜单选择例如1咖啡或2软饮料等价格从那里计算。有没有办法做到这一点？

根据您的上一条评论，第二个答案是

tot = 0
 product_menu_hash = {
"Coffee" => 4.00,
"Soft Drink" => 4.00,
"Sandwich (Meat)" => 9.50,
"Sandwich (Veg)" => 8.00,
"Coffee Maker" => 50.00,
"Bag of Coffee (250g)" => 13.25,
  }
 product_choice = {}

product_menu_hash.each_with_index do |(item,  price), index|
     product_choice[index+1]=item
    puts "#{index + 1} #{item} = $#{price}"
end
puts 'x to exit, p to print total   ' 
choice = gets.chomp
while choice != 'x' do
    if choice == 'p' then
        puts 'total: ', tot
    else
        puts product_choice[choice.to_i],product_menu_hash[product_choice[choice.to_i]]
        tot += product_menu_hash[product_choice[choice.to_i]]
    end
    choice = gets.chomp
end

Ruby：Food菜单，用于计算和显示您选择的余额

2 个答案: