A C Programming Challenge

I have a challenge for you. Is there a problem with this code? It compiles without warnings, and runs as expected. I’ll reveal all next week. Have fun!

g++ -g -Wall palindrome_problem.cpp

#include <iostream>
#include <string.h>

using namespace std;

char* isPalindrome(char* word)
{
    char* ret = 0;
    ret = (char*)"Yes! This is a palindrome.";
	
    char *p = word;
    int len = strlen(word);
    char *q = &word[len-1];

    for (int i = 0 ; i < len ; ++i, ++p, --q)
    {
        if (*p != *q)
        {
            ret = (char*)"This is not a palindrome.";
        }
    }
    return ret; 
} 

int main()
{ 	
    while (1)
    {
        char buffer[16] = {0};
        cin >> buffer;

        char* result = isPalindrome(buffer);

        cout << result << endl;
    }
    return 0;
}