# 💻 Day 1: Welcome to Coding — HackMD Learning Log

## 📅 Date
2025-06-09

## ✅ Challenge 1

### 📱 Age Calculator (with current year)

import datetime

today = datetime.date.today()
current_year = today.year

birth_year = int(input("What year were you born? "))
age = current_year - birth_year

print(f"You are {age} years old in {current_year}!

#### 📖note
`int()`:Convert to number
`str()`:Convert to string
`input()`:Get user input
f-strings:print(f".....<font color="#66ccff">{container}</font>......")

## ✅ Bonus

### 🙋‍♂️Welcome Function

def welcome(name):
    print(f"Hello,{name} nice to meet you!")
    print("Hope you’re ready to become a CS Master! 💻🔥")


user_name = input("what is your name?")
welcome(user_name)

#### 📖note
`def(container)` function: set up Reusable code block
<font color="#66ccff">changable variant</font> to output different outcome

## 📓 What I Learned Today
- How to use `print()`, `input()`, and basic variables in Python
- The difference between `+` and `,` in print
- How to get the **current year** using `datetime`
- How to define and call a function
- How to write cleaner code using **f-strings**
## 🔍 Questions or Confusions
- Difference between `,` and `+` in print
- When to use `int()` and why input is string
## 🧠 My Reflection
Always double-check your spelling and grammar to ensure your code comments and explanations are clear and professional.
### 💡 Coding Tip of the Day

> <font color="#66ccff"><b>When you're coding, it's better to write clearly and in detail than to rush through it. Break your code into sections instead of lumping everything together.</b></font>

🧠 Good code isn't just for machines to run — it's also for **humans to read** (including future you)!

（📝 中文：當你在編程時，寫得詳細明白比急著寫完更重要。請記得把程式分段清楚，而不是擠成一團。）