HW02 運算子表達式

1.NotebookLM

2.

3.學習卡和測驗

4.115103122%7+1=2

# 🔢 4-Digit Number Digit Sum Calculator

A lightweight, beginner-friendly Python script that prompts the user for a 4-digit integer, extracts each individual digit using basic mathematical operators, and calculates their sum.

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## 🚀 Features

* **Mathematical Extraction:** Uses modulo (`%`) and integer division (`//`) to isolate each digit without converting the number into a string.

* **Interactive Prompt:** Takes live user input via the console.

* **Instant Calculation:** Computes and displays the sum of all four digits immediately.

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## 💻 Code

```python

num = eval(input('Enter 4 digit number: '))

print('Entered number is:', num)

r1 = num % 10

q1 = num // 10

r2 = q1 % 10

q2 = q1 // 10

r3 = q2 % 10

q3 = q2 // 10

r4 = q3 % 10

print('Sum of all the digits within number', num, 'is :', (r1 + r2 + r3 + r4))