Life in Weeks

受 1.4 User Input启发想到做这个小工具

很多人第一次看到这张「人生周数图」的时候，都会突然意识到：时间其实过得比我们想象的要快。这个「Life in Weeks」其实并不是什么神秘的软件，它背后的逻辑和你们刚刚在课上学到的编程思想是一样的。很多程序看起来很复杂，但本质上都可以拆成三个简单的步骤：

1. 输入（Input）
程序先向你要一些信息，比如你的年龄、你希望活到多少岁、以及你喜欢的颜色。这一步就和我们在课上学的 readLine()、readInt() 是一样的，让用户把数据输入进来。

2. 处理（Process）
接下来计算机会在后台做一些简单的计算。比如：一年大约有 52 周，所以程序会用 年龄 × 52 来算出你已经度过了多少周，再根据你的预期寿命算出还有多少周。这些其实就是我们在编程里最常见的：变量 + 数学运算。

3. 输出（Output）
最后，程序把结果展示出来。它根据计算的结果，把已经度过的那些周用你喜欢的颜色标出来，剩下的周则保持空白，于是就形成了你现在看到的这张「人生时间地图」。

所以你会发现，一个看起来很有意思的小工具，背后其实就是我们刚刚学到的几个基础概念： 输入 → 计算 → 输出。

接下来你们的挑战就是：尝试用你们现在学到的基础 JavaScript，写一个属于自己的小程序。它不需要这么复杂，甚至只用文字输出也可以，但核心思想是一样的。

💻 Coding Challenge for You

Now it's your turn to build a small program. You don't need to create a visual page like this one. Instead, use the basic JavaScript skills you just learned to make a simple program that runs in the console and prints text results.

Your program should include three steps:

Input: Ask the user for some information using readLine(), readInt(), or readFloat().
Process: Do a small calculation using the numbers the user entered.
Output: Print the result clearly using console.log().

You can choose one of these ideas to implement:

1️⃣ Weeks of Life Calculator
Ask the user for their age. Calculate how many weeks they have lived so far using:
weeks = age × 52
Then print a message such as:
You have lived about ___ weeks.
2️⃣ Weeks Until a Milestone
Ask the user for their current age and a target age (for example 18, graduation, or another goal). Calculate how many weeks remain until that milestone and print the result.
3️⃣ Simple Weekly Habit Tracker
Ask the user how many days this week they completed a goal (for example studying, reading, or exercising). Then print a row of symbols showing the week, like this:
[x] [x] [x] [ ] [ ] [ ] [ ]
Each box represents one day. Use [x] for completed days.

Your program does not need to be complicated. As long as it follows the idea of Input → Calculation → Output, you have successfully built your own small program.