From 09d2cd89964e71828f9a57a8e7ca20bb101f90ed Mon Sep 17 00:00:00 2001
From: Siddharth Sandilaya <siddh2913@gmail.com>
Date: Thu, 23 Oct 2025 15:13:13 +0530
Subject: [PATCH 1/2] feat(math): add palindrome number checker in C++ without
 non-standard headers

---
 math/palindrome_number.cpp | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 math/palindrome_number.cpp

diff --git a/math/palindrome_number.cpp b/math/palindrome_number.cpp
new file mode 100644
index 0000000000..12df2489b3
--- /dev/null
+++ b/math/palindrome_number.cpp
@@ -0,0 +1,29 @@
+#include <iostream>
+#include <string>
+#include <vector>
+
+// Function to check if a number is a palindrome
+bool is_palindrome_number(long long n) {
+    if (n < 0)
+        return false;  // Negative numbers are not palindromes
+    std::string s = std::to_string(n);
+    int i = 0, j = static_cast<int>(s.size()) - 1;
+    while (i < j) {
+        if (s[i] != s[j])
+            return false;
+        ++i;
+        --j;
+    }
+    return true;
+}
+
+#ifdef RUN_LOCAL
+int main() {
+    std::vector<long long> tests = {121, -121, 10, 12321, 0};
+    for (auto t : tests) {
+        std::cout << t << " -> " << (is_palindrome_number(t) ? "True" : "False")
+                  << "\n";
+    }
+    return 0;
+}
+#endif
\ No newline at end of file

From 04985be498065b9e743d8b92559dbf3fbbbe1563 Mon Sep 17 00:00:00 2001
From: Siddharth Sandilaya <siddh2913@gmail.com>
Date: Thu, 23 Oct 2025 15:18:33 +0530
Subject: [PATCH 2/2] feat(math): add palindrome number checker using standard
 headers

---
 math/palindrome_number.cpp | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/math/palindrome_number.cpp b/math/palindrome_number.cpp
index 12df2489b3..46f383d166 100644
--- a/math/palindrome_number.cpp
+++ b/math/palindrome_number.cpp
@@ -1,11 +1,26 @@
+/**
+ * @file
+ * @brief Check if a given number is a palindrome
+ * @details
+ * This program defines a function `is_palindrome_number()` which checks whether
+ * a number reads the same backward as forward.
+ * Negative numbers are treated as non-palindromic.
+ *
+ * @see https://en.wikipedia.org/wiki/Palindrome
+ */
+
 #include <iostream>
 #include <string>
 #include <vector>
 
-// Function to check if a number is a palindrome
+/**
+ * @brief Checks if an integer is a palindrome number.
+ * @param n The number to check.
+ * @return `true` if `n` is a palindrome, otherwise `false`.
+ */
 bool is_palindrome_number(long long n) {
     if (n < 0)
-        return false;  // Negative numbers are not palindromes
+        return false;
     std::string s = std::to_string(n);
     int i = 0, j = static_cast<int>(s.size()) - 1;
     while (i < j) {
@@ -18,6 +33,9 @@ bool is_palindrome_number(long long n) {
 }
 
 #ifdef RUN_LOCAL
+/**
+ * @brief Example test cases for the palindrome number checker.
+ */
 int main() {
     std::vector<long long> tests = {121, -121, 10, 12321, 0};
     for (auto t : tests) {