![]() Log into your account at and go to the Xojo Pi Store page to get yours. Xojo Pi licenses let you build console and desktop apps for the Raspberry Pi for free. Now it is not a powerful computer, to be sure, but it is still powerful enough for many tasks. Even though this simple app does not really need a separate class to do the actual tip calculation, you will make one to keep the steps aligning closely with the original Swift tutorial. Welcome to Xojo, an integrated software developer tool and programming language that is the easiest way to make desktop, web and iOS apps. You can plug in storage and install an operating system on it (typically Linux). Xojo uses an event-driven programming model that is much easier to work with (although you can also use MVC if you want). You can connect a keyboard, mouse and display to it. To swap lines, put the cursor on a line and press Option+Up Arrow (Mac) or Alt+Up Arrow (Win/Linux) to move the line up in the code. Still, a Raspberry Pi is a full computer. Xojo’s Code Editor now lets you move a line or a selection up or down or duplicate entire lines (or a selection). What makes the Raspberry Pi somewhat unique is that it uses an ARM processor (similar to what you see on cell phones and tablets), rather than an Intel CPU that is in most things typically categorized as "computers". The Raspberry Pi and other similar computers are also referred to as "single-board" computers. This makes the Raspberry Pi a favorite amongst tinkerers, Makers, electronics hobbyists and anyone else with a cool idea for a project. Additionally, because a Raspberry Pi is a fully functional computer, with input/output, storage and wifi capabilities, it can also be used to interface and control other things. ![]() Since it is also inexpensive, it functions as a great learning tool, making it possible for anyone to have their own computer. Because it is tiny, it can be used in all kinds of things that a typical computer does not work well with, such as robotics and embedded systems. Raspberry Pi is essentially a tiny, inexpensive computer (about US$35).
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