总额和平均值

本课属于 Coddy GDScript 学习旅程的“基础知识”单元。第 87 课，共 92 课。

挑战

简单

处理选项 3，计算费用总额和平均值。保留你在前几个步骤中写的所有内容。

如果费用数组为空，打印：

No expenses recorded yet.

否则，分两行打印总额和平均值。费用为 100、200 和 300 时，输出为：

Total expense: 600.0
Average expense: 200.0

亲手试试

extends Node

func _ready():
	print("Welcome to the Daily Expense Tracker!")

	# 显示一次菜单
	print("\nMenu:")
	print("1. Add a new expense")
	print("2. View all expenses")
	print("3. Calculate total and average expense")
	print("4. Clear all expenses")
	print("5. Exit")

	# 用于存放支出的空数组
	var expenses: Array[float] = []

	while true:
		# 获取用户的选择
		var choice := OS.read_string_from_stdin()

		if choice == "1":
			# 添加一笔新支出
			var amount := float(OS.read_string_from_stdin())
			expenses.append(amount)
			print("Expense added successfully!")
		elif choice == "2":
			# 查看所有支出
			if expenses.is_empty():
				print("No expenses recorded yet.")
			else:
				print("Your expenses:")
				for i in range(expenses.size()):
					print(i + 1, ". ", expenses[i])
		elif choice == "5":
			# 退出程序
			print("Exiting the Daily Expense Tracker. Goodbye!")
			break