Let us start by making the smallest, most immediate C++ program possible, then use the convenient environment to test small snippets of C++ code throughout this chapter. In order to do that, we must have a *compiler*, which is a program that translates some code into an actual runnable app, sometimes referred to as the executable file. C++ compilers are mostly free of charge to download, and in a lot of cases, open source. The apps we generate will not automatically show up in places like Apple's App store, Google Play, Steam, Ubuntu Apps Directory, or Pi Store. Instead, they are your personal, private program files and you will be responsible for manually sharing them later on. In the following chapter *OF Setup and Project Structure*, the compiler will sit on your local computer, able to run offline. For now, we will be impatient and compile some casual C++ on the web using a convenient tool by Sphere Research Labs. Please open your web browser and go to [ideone](http://ideone.com) (http://ideone.com).
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