to find if a given string is palindrome or is not palindrome

Question

I made a program to find if a entered string is palindrome or not palindrome but it always says that its not a palindrome

#include  
#include          


        

Answer 1

From the 2005 version of myself:

bool isAlphaNumeric(char c)
{
    return (iswalpha(c) || iswdigit(c));
}

bool isPalindrome(char *str)
{
    /* A man, a plan, Anal Panama!!! */
    if(*str == '\0')
    {
        return false;
    }

    int len = strlen(str);
    if(len <= 1) return true;

    char *start = str;
    char *end = start + len - 1;

    while(start < end)
    {
        if(!isAlphaNumeric(*start))
        {
            *start++;
            continue;
        }
        if(!isAlphaNumeric(*end))
        {
            *end--;
            continue;
        }
        if(towlower(*start) != towlower(*end))
        {
            return false;
        }
        *start++;
        *end--;
    }
    return true;
}