This routine will take an 8 bit integer that corresponds to the numerator of a fraction whose denominator is 256 and find its arctangent. So the input ranges from 0 to 255 which corresponds to 0 to 255/256 = 0.996 . The output for an arctangent routine that returns a floating point number would be from 0 (atan(0)) to 0.783 (atan(255/256)) radians; or if you prefer, 0 to 44.89 degrees. However, this routine scales the output so that pi/4 radians (or 45 degrees) corresponds to 256. So for the input range of 0 to 255 you get an output of 0 to 255 ( atan(255/256) * 256 / (pi/4) is about 255). It's probably a little more interesting to see an intermediate data point or two:
In this excerpt, one of a series from Java Network Programming, 3rd Edition, Elliotte Rusty Harold demonstrates Java's handling of URLs, URIs, proxy servers, password protection, and HTTP GET.
Every field comes up with its own jargon, and oftentimes subgroups within a field come up with their own specific words or phrases (those of you familiar with Microsoft Canada’s Developer and Platform Evangelism Team know that we have our own term for “broken”, named after one of our teammates who is notorious for killing all sorts of tech gear).
A question recently posted on Stack Overflow asked for people to submit programming terms that they or their team have coined and have come into regular use in their own circles. I took a number of the submissions and compiled them into the alphabetically ordered list below for your education and entertainment.
ROME is an set of open source Java tools for parsing, generating and publishing RSS and Atom feeds. The core ROME library depends only on the JDOM XML parser and supports parsing, generating and converting all of the popular RSS and Atom formats including RSS 0.90, RSS 0.91 Netscape, RSS 0.91 Userland, RSS 0.92, RSS 0.93, RSS 0.94, RSS 1.0, RSS 2.0, Atom 0.3, and Atom 1.0. You can parse to an RSS object model, an Atom object model or an abstract SyndFeed model that can model either family of formats.
Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. It's intended for artists, designers, hobbyists, and anyone interested in creating interactive objects or environments.
Arduino can sense the environment by receiving input from a variety of sensors and can affect its surroundings by controlling lights, motors, and other actuators. The microcontroller on the board is programmed using the Arduino programming language (based on Wiring) and the Arduino development environment (based on Processing). Arduino projects can be stand-alone or they can communicate with software on running on a computer (e.g. Flash, Processing, MaxMSP).
The boards can be built by hand or purchased preassembled; the software can be downloaded for free. The hardware reference designs (CAD files) are available under an open-source license, you are free to adapt them to your needs.
Scala ist eine elegante, ausdrucksstarke Programmiersprache, die sich in letzter Zeit zunehmender Beliebtheit und Verbreitung erfreut. Sie lässt sich gut mit Java und der .NET-Plattform integrieren und ist als "General Purpose Language" für alle Aufgaben geeignet, für die man sonst Java oder C# verwendet.
Object and Class Structures,
Type Checking and New Types,
Initializing a New Class,
GtkArg and the Type System,
Object Arguments,
Signals,
Object Finalization,
Attaching Data to Objects
I'm currently in the process of expanding my programming horizons to linux. In order to do that, it is important to have a good basic toolset on which you can rely on. and what is more basic then the IDE in which you write your code?
The most basic rule of GNU Make and the environment is that any variable set in the environment when GNU Make is started will be available as a GNU Make macro inside the Makefile. For example, if FOO is set in the environment to foo when GNU Make is run then the following Makefile: $(warning $(FOO))
