Kiểm tra chuỗi đối xứng trong C, 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 ");
}

#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";
}