theory

I've heard that it's possible to accomplish this using the modulus % operator present in most programming languages. The real question is, how? I'm unfamiliar with how modulus works, so I've had difficulties using it in the past. Given the present time here in seconds since 1970, 1307758473.484 , how can I calculate how many years that is, days that is, hours that is, and minutes that is using modulus? I'm essentially looking to format it like this: "5 years, 10 days, 12 hours, 7 minutes, and 18.56 seconds". How would I do this? I'm really interested in learning the logic behind this and not

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CORE Computer Science Conference Rankings Acronym Standard Name Rank AAAI National Conference of the American Association for Artificial Intelligence A+ AAMAS International Conference on Autonomous Agents and Multiagent Systems A+ ACL Association of Computational Linguistics A+ ACMMM ACM Multimedia Conference A+ ASPLOS Architectural Support for Programming Languages and Operating Systems A+ CAV Computer Aided Verification A+ CCS ACM Conference on Computer and Communications Security A+ CHI International Conference on Human Factors in Computing Systems A+ COLT Annual Conference on Computational

Scenario: There is a database of movies a user owns, movies are displayed on a page called "my-movies", the movies can be displayed in the order that the user desires. For example "Fight Club" in position #1, "Drive" in position #3 and so on and so forth. The obvious solution is to store a position with each item, for example: movieid, userid, position 1 | 1 | 1 2 | 1 | 2 3 | 1 | 3 Then when outputting the data is ordered by the position. This method works fine for output however it has a problem when updating: the position of an item all the other positions need to be updated because

By "theoretical computer science topics", I am referring to things such as regular vs non-regular languages, the pumping lemma, and grammars. I'm familiar with the real world applications of finite automata and regular expressions, but topics such as these other ones are giving me more problems as I'm not seeing any real world applications. These things are useful if you want to know whether trying to do something is futile with regular expressions. For example, knowing that XML is non-regular is useful if the idea to parse XML with regex ever enters your mind. And if you don't know off the

This is a sentence from Eric Lippert's blog : Given that unfortunate situation, it makes sense to emphasize the storage mechanism first, and then the semantics second. It's easy to get a dictionary definition of what "semantic" means but what does it mean in terms of computer jargon? but what does it mean in terms of computer jargon? Essentially the same thing. Example: x = 5; The above is the syntax (representation). The meaning (i.e. the semantics) of this term is to assign the value 5 to a symbol (variable, whatever) called x . Different languages offer different syntaxes to provide the

I'm reading up about the Lambda-Cube, and I'm particularly interested in System F-omega, which allows for "type operators" i.e. types depending on types. This sounds a lot like GHC's type families. For example type family Foo a type instance Foo Int = Int type instance Foo Float = ... ... where the actual type depends on the type parameter a . Am I right in thinking that type families are an example of the type operators ala system F-omega? Or am I out in left field? System F-omega allows universal quantification, abstraction and application at higher kinds , so not only over types (at kind *

According to the Typeclassopedia (among other sources), Applicative logically belongs between Monad and Pointed (and thus Functor ) in the type class hierarchy, so we would ideally have something like this if the Haskell prelude were written today: class Functor f where fmap :: (a -> b) -> f a -> f b class Functor f => Pointed f where pure :: a -> f a class Pointed f => Applicative f where (<*>) :: f (a -> b) -> f a -> f b class Applicative m => Monad m where -- either the traditional bind operation (>>=) :: (m a) -> (a -> m b) -> m b -- or the join operation, which together with fmap is