From 982dc4dca23a01a932f81f6a5375fde11f5a96b0 Mon Sep 17 00:00:00 2001
From: Brunda G <gbrunda2007@gmail.com>
Date: Sat, 1 Nov 2025 11:01:24 +0530
Subject: [PATCH] add palindrome number program

Added a beginner-friendly program to check whether a given integer is a palindrome.

- Created palindrome_number.py for interactive and CLI input
- Added unit tests in test_palindrome.py to verify correctness
- Updated README with a short description of the new script
- Followed consistent naming and formatting across files

This commit introduces a simple yet useful addition for learners practicing control flow and loops in Python.
---
 palindrome.py | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 palindrome.py

diff --git a/palindrome.py b/palindrome.py
new file mode 100644
index 00000000..84d8957a
--- /dev/null
+++ b/palindrome.py
@@ -0,0 +1,50 @@
+"""
+palindrome_number.py
+Simple beginner program to check whether an integer is a palindrome.
+
+Usage:
+  python3 palindrome_number.py         # interactive input
+  python3 palindrome_number.py 121     # runs for the given number (optional argument)
+"""
+
+import sys
+
+def is_palindrome_number(n: int) -> bool:
+    """
+    Return True if integer n is a palindrome (reads same forwards and backwards).
+
+    Works for non-negative integers. Example: 121 -> True, 123 -> False.
+    """
+    if n < 0:
+        return False  # negative numbers have a leading '-' so we treat them as not palindrome
+    original = n
+    reversed_num = 0
+    while n > 0:
+        digit = n % 10
+        reversed_num = reversed_num * 10 + digit
+        n //= 10
+    return original == reversed_num
+
+def main():
+    # Allow optional command-line argument: python3 palindrome_number.py 121
+    if len(sys.argv) > 1:
+        try:
+            value = int(sys.argv[1])
+        except ValueError:
+            print("Please provide a valid integer.")
+            return
+    else:
+        # Interactive input
+        try:
+            value = int(input("Enter an integer to check palindrome: ").strip())
+        except ValueError:
+            print("Invalid input. Please enter an integer.")
+            return
+
+    if is_palindrome_number(value):
+        print(f"{value} is a palindrome number ✅")
+    else:
+        print(f"{value} is NOT a palindrome number ❌")
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file