A common riddle-like question for programmers asks them to swap the values of two integers *without* a temporary intermediate value. There are two common solutions that I’m aware of, addition swap and XOR swap. Here’s what each looks like in C:

Shaders provide programmers with a beautiful combination of art and math. Most other throwaway projects are devoid of any artistic value. In less than a dozen lines of code you can draw fractals. A few more and you can start creating intricate animations. The most interesting part is the unique perspective they force you into.
Say you want to draw a circle in an imperative programming language. You need to break out a for loop and calculate the sin and cos of different angles until you have points all around the circumference of a circle.

The intention is to force myself to get a small taste of a bunch of new programming languages and programming paradigms. Since I was late to the party I rushed through the first 4 problems in languages I’m familiar with. But for day 5 I solved the daily problem with MIPS assembly. I look forward to learning and writing Common Lisp, Haskell, Prolog, and many more languages.
One hope I have is to complete a problem in GLSL.

Commit-Language-Visualizer
After a stroke of inspiration earlier this evening I hacked together this tool. It produces a stacked time-series graph of GitHub commit data. The commit data is organized by language and uses the same colors as GitHub for each corresponding language.

It’s very common for high-school students to learn the geometry of a circle.

Trigonometric functions (`sin()`

, `cos()`

, etc.) are required knowledge for

high-school graduates, and they have a close relationship to circles. This means

that most students have seen the equation for a unit circle:

How images are rendered Imagine your computer is rendering an image of a tomato on top of a table. In order to render the image each of the 1920 * 1080 pixels on your screen needs to have colors assigned to them. This isn’t as easy as viewing a video or an image. The tomato can be viewed from any angle, and the pixels will need to be recalculated many times every second to produce a smooth animation.