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本课属于 Coddy Ruby 学习旅程的“基础知识”单元。第 82 课，共 88 课。

挑战

简单

在你的费用追踪器中添加“查看费用”功能。

你的程序应当：

初始化一个名为 expenses 的空数组
创建一个 loop do，用于显示菜单并读取用户输入
当用户输入 "1" 时，提示用户输入费用名称和金额，创建一个包含 :name 和 :amount 键的哈希，将其添加到 expenses 数组中，并打印 Expense added!
当用户输入 "2" 时，显示所有费用；如果没有费用，则显示一条消息
当用户输入 "5" 时，打印 Goodbye! 并退出循环

菜单应与之前完全一致：


--- Expense Tracker ---
1. Add Expense
2. View Expenses
3. Total & Average
4. Clear All
5. Exit
Choose an option:

选择选项 "2" 时：

如果没有费用，打印：No expenses recorded yet.
如果有费用，先打印一个空行，然后打印 --- Your Expenses ---，再按以下格式打印每笔费用：Name: $Amount

例如，如果输入依次为 2、5（在没有费用时查看），输出应为：


--- Expense Tracker ---
1. Add Expense
2. View Expenses
3. Total & Average
4. Clear All
5. Exit
Choose an option: No expenses recorded yet.

--- Expense Tracker ---
1. Add Expense
2. View Expenses
3. Total & Average
4. Clear All
5. Exit
Choose an option: Goodbye!

如果输入依次为 1、Coffee、4.5、1、Lunch、12.0、2、5，输出应为：


--- Expense Tracker ---
1. Add Expense
2. View Expenses
3. Total & Average
4. Clear All
5. Exit
Choose an option: Expense name: Amount: Expense added!

--- Expense Tracker ---
1. Add Expense
2. View Expenses
3. Total & Average
4. Clear All
5. Exit
Choose an option: Expense name: Amount: Expense added!

--- Expense Tracker ---
1. Add Expense
2. View Expenses
3. Total & Average
4. Clear All
5. Exit
Choose an option: 
--- Your Expenses ---
Coffee: $4.5
Lunch: $12.0

--- Expense Tracker ---
1. Add Expense
2. View Expenses
3. Total & Average
4. Clear All
5. Exit
Choose an option: Goodbye!

亲手试试

expenses = []

loop do
  puts "--- Expense Tracker ---"
  puts "1. Add Expense"
  puts "2. View Expenses"
  puts "3. Total & Average"
  puts "4. Clear All"
  puts "5. Exit"
  print "Choose an option: "
  
  choice = gets.chomp
  
  if choice == "1"
    print "Expense name: "
    name = gets.chomp
    print "Amount: "
    amount = gets.chomp.to_f
    expenses.push({name: name, amount: amount})
    puts "Expense added!"
    puts ""
  elsif choice == "5"
    puts "Goodbye!"
    break
  end
end