Check a Palindrome
A palindrome is unchanged when its character order is reversed.
What is Check a Palindrome?
A palindrome is unchanged when its character order is reversed.
Check whether a word reads the same in both directions.
Important points
- Compile with warnings enabled and fix every warning.
- Know the lifetime and type of every value.
- Validate input and keep array bounds explicit.
C and C++ code examples
main.c
#include <stdio.h>
#include <string.h>
int main(void) {
const char *text = "level"; size_t length = strlen(text); int palindrome = 1;
// Compare characters mirrored around the center.
for (size_t i = 0; i < length / 2; ++i)
if (text[i] != text[length - 1 - i]) { palindrome = 0; break; }
printf("%s is %sa palindrome\n", text, palindrome ? "" : "not ");
}
level is a palindromeC++
main.cpp
#include <algorithm>
#include <iostream>
#include <string>
int main() {
std::string text = "level";
// equal compares the first half with a reversed view.
bool palindrome = std::equal(text.begin(), text.begin() + text.size() / 2, text.rbegin());
std::cout << text << " is " << (palindrome ? "" : "not ") << "a palindrome\n";
}
level is a palindromeC and C++ comparison
Compare mirrored positions and stop at the middle because every pair is checked once.
C
C exposes small procedural APIs and makes representation details explicit.
C++
C++ retains the low-level model while adding safer library types and abstractions.
Practice exercises
Run both versions, then modify them to observe the different language guarantees.
- Add invalid and boundary-value inputs.
- Compile with -Wall -Wextra -Wpedantic.
- Move reusable declarations into a header and implementation file.