115103140 判斷敘述式

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1. Leap Year Checker

📌 Description

This Python program asks the user to enter a year and checks whether the year is a leap year.

A leap year has 366 days, including February 29. A normal year has 365 days.

💻 Python Code

year = int(input('Enter year: '))

if (year % 4 == 0) and (not (year % 100 == 0)) or (year % 400 == 0):
    print('Year', year, 'is a Leap Year')
else:
    print('Year', year, 'is not a Leap Year')

🧮 Leap Year Rules

A year is a leap year if:

It is divisible by 4 but not divisible by 100; or
It is divisible by 400.

▶️ Example Output

Enter year: 1944
Year 1944 is a Leap Year

📝 Explanation

input() asks the user to enter a year.
int() converts the entered value into an integer.
% is the modulus operator. It returns the remainder after division.
year % 4 == 0 checks whether the year is divisible by 4.
not (year % 100 == 0) checks whether the year is not divisible by 100.
year % 400 == 0 checks whether the year is divisible by 400.
if and else display the appropriate result.

🛠️ Requirements

Python 3.x

🚀 How to Run

Save the code as leap_year.py.
Open a terminal or command prompt.
Run the following command:

python leap_year.py

📚 Learning Objectives

Using input() to receive user input.
Converting input to an integer using int().
Using the modulus operator %.
Applying logical operators such as and, or, and not.
Using conditional statements to make decisions.

📄 License

This project is for educational purposes.

中文程式說明

這個程式用來判斷使用者輸入的年份是否為閏年（Leap Year）。

閏年的判斷規則

年份可以被 4 整除，但不能被 100 整除，就是閏年。
年份可以被 400 整除，也是閏年。
其他情況則不是閏年。

程式執行範例

輸入 1944：

1944 % 4 == 0：成立。
1944 % 100 == 0：不成立。
因此，1944 是閏年。

輸出結果：

Enter year: 1944
Year 1944 is a Leap Year

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115103140