Re: When is "z" != "z" ?

On Mon, 2006-06-05 at 22:00, tedd wrote: > At 8:18 PM -0500 6/5/06, Larry Garfield wrote: > >See how the comparison works? It's a purely alphabetic comparison. > > > >As for the increment, it actually would never have occurred to me to ++ a > >string before this thread, honestly. :-) However, what it appears to be > >doing (and I'm sure Rasmus will correct me if I'm wrong) is using a "string > >base" instead of a numeric base. Thus a++ = b, b++=c, etc. z++ "rolls > >over" > >to the next "digit" (which because it's a string goes to the right rather > >than the left), and resets. So just as 9++ rolls over to 10, z rolls over to > >aa. > > > >Does that make more sense? > > Maybe to you, but not me. > > In my book, you can't add a positive value to z and produce something that is less than z. > > For example, "aa" is not greater than "z" -- is it? If I remember my abstract algebra correctly, the modulus operator forms a set for any given value right operand. Interestingly then taking the set of x%10 we find that adding 1 to x when x is 9 is indeed less than 9. I'm sure I could summarize this better if I could remember my abstract algebra and spaces *lol*. I remember vaguely proving spaces and stuff based on various properties. Either way the above exmaple gives a simple case where your assertion also fails, and this is in the world of general mathematics. Cheers, Rob. -- .------------------------------------------------------------. | InterJinn Application Framework - http://www.interjinn.com | :------------------------------------------------------------: | An application and templating framework for PHP. Boasting | | a powerful, scalable system for accessing system services | | such as forms, properties, sessions, and caches. InterJinn | | also provides an extremely flexible architecture for | | creating re-usable components quickly and easily. | `------------------------------------------------------------'