> Our last function is strcmp. It looks at two strings and determines whether they are equal to each other or not. If they are it returns 0. If they aren’t it returns 1.

No it doesn’t.

    RETURN VALUES
         The strcmp() and strncmp() functions return an integer greater than, equal
         to, or less than 0, according as the string s1 is greater than, equal to,
         or less than the string s2.  The comparison is done using unsigned
         characters, so that ‘\200’ is greater than ‘\0’.