Sparse files – what, why, and how « UNIX Administratosphere Sparse files are basically just like any other file except that blocks that only contain zeros (i.e., nothing) are not actually stored on disk. This means you can have an apparently 16G file – with 16G of “data” – only taking up 1G of space on disk. This can be particularly useful in situations where the full disk may never be completely used. One such situation would be virtual machines. If a virtual machine never fills the disk entirely, then a certain amount of the disk will never have anything but zeros in it – permitting the saving of disk space by using a sparse file. The operating system (which supports sparse files) knows that the block “exists” but is null, so it provides the zero-filled block out of thin air. There are problems with using sparse files. Another problem is that everything about disk management is based on how many sectors or blocks are used – and the disk size reported for a sparse file is the full size of the file (not the actual number of blocks on disk).
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Nick Farina - An iOS Developer Takes on Android Recently, we released the Android version of Meridian, our platform for building location-based apps. We didn’t use one of these “Cross Platform!” tools like Titanium. We decided it was important to keep the native stuff native, and to respect each platform’s conventions as much as possible. Now, our platform leverages HTML5 (buzzword, sorry) in many places for branding and content display, so we got a fair amount of UI for free. So, we rolled up our sleeves, downloaded the Android SDK, and got to work. Development Environment Apple has made it pretty easy to start writing iOS apps. Android is a bit more involved. If you want to waste a week or so playing around and not getting work done, you could explore the many tempting alternatives to writing Java in Eclipse. But let’s assume you are on a deadline and want to do things the way that Google endorses. You’re going to just hate Eclipse. Eclipse is a world unto itself. The Java Language Java is a high level programming language. Debugging
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Harvard Researchers Build $10 Robot That Can Teach Kids to Code Mike Rubenstein, Harvard University Mike Rubenstein wants to put robots in the classroom. Working with two other researchers at Harvard University, Rubenstein recently created what they call AERobot, a bot that can help teach programming and artificial intelligence to middle school kids and high schoolers. That may seem like a rather expensive luxury for most schools, but it’s not. The tool is part of a widespread effort to teach programming and other computer skills to more children, at earlier stages. Rubenstein’s project grew out of the 2014 AFRON Challenge, held back in January, which called for researchers to design low-cost robotic systems for education in the developing world. He and his colleagues assembled most of the electronics with a pick-and-place machine—a machine that automatically builds printed circuit boards—and in order to further cut costs, they used vibration motors for locomotion and left out a chassis.
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Apprendre à écrire ou à coder ? Programmer ou être programmé(e) ? Premier argument en faveur de l’apprentissage du code informatique lors de la scolarité : Syntec Numérique, le syndicat qui regroupe les entreprises du secteur, alerte les pouvoirs publics depuis des années sur les difficultés de recrutement d‘informaticiens correspondant à leurs besoins. L’émergence de structures éducatives hybrides illustre le décalage (ou «mismatch») entre formation et profils recherchés, à l’image de l’école 42, une école d’informatique gratuite ouverte à toutes les personnes âgées de 18 à 30 ans, sans condition de diplômes préalables, lancée à l’initiative du PDG de Free en France. 40 000 candidatures ont été reçues en seulement quelques semaines pour 1 000 admis. D’autre part, la vie des individus, des collectivités comme des entreprises est de plus en plus régie par des algorithmes et des programmes informatiques dont la logique détermine une certaine façon de penser. Apprendre à coder dès le primaire… Exemple d’écriture cursive.
architecture - How do I create my own programming language and a compiler for it - Programmers - Stack Exchange