Isalpha not working

Question

I'm trying to use isalpha, but for some reason it's not working and counting everything, including spaces and punctuation. I tried to use isupper||islower with the same results. Any ideas why this is happening or something else i can use instead. Thanks!

string txt = get_string ("Text: ");

    int length = 0;
    for (int i = 0; i < strlen(txt); i++)
    {
        if (isalpha(*txt))
        {
          length ++;
        }
    }
    
    printf("%i letter(s)\n", length);

Answer 1

Without seeing how you're using it, there's no way to answer.

However, note that isalpha, isupper, islower, etc., can ONLY look at one character. If you pass it a string, like argv[1], it will result in a seg fault.