determine if a string is a palindrome or not

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Dammit, I'm mad!

The solution is to start comparing characters from the start of the string and the end of the string. Here is the function in it's entirety...

#include <iostream>

#include <cstring>


bool is_palindrome(const char *str)
{
    if( !str )
    {
        std::cout << "Parameter is null? Returning false\n";
        return false;
    }

    std::cout << "is_palindrome called '" << str << "'...\n";
    const char *end = ::strchr(str, '\0');
    while( end > str)
    {
        while(*str && !isalpha(*str) )
            ++str;
        while( !isalpha(*end) && end > str)
            --end;
        std::cout << "\tcomparing '" << *str << "' and " << *end << "'\n";
        if( tolower(*str) != tolower(*end))
            return false;
        ++str;
        --end;
    }
    return true;
}


int main(int argc, char **argv)
{
    std::cout << is_palindrome("hello") << "\n";
    std::cout << is_palindrome("A dog, a plan, a canal: pagoda.") << "\n";
    std::cout << is_palindrome("As I pee, sir, I see Pisa!  ") << "\n";
    std::cout << is_palindrome("Dentist? Sit Ned.") << "\n";
    return 0;
}