Add computus in C++

[VincentZalzal]

No description provided.

[berquist]

I have one request. For your two conditionals, can you add braces? Everything else looks good.

[VincentZalzal]

Sure, no problem. I also added braces to the for-loop, for consistency. Would be nice to have a style guide somewhere for that kind of stuff. At least, clang-format handles a big chunk of that already.

[berquist]

Thanks for making those changes. We do have https://github.com/algorithm-archivists/algorithm-archive/blob/master/.clang-format, but like EditorConfig, there's sometimes a barrier of helping people get those set up properly with their environment.

As for style guides, C++ in particular was a bit contentious is the past, but generally speaking, the start of one is in https://github.com/algorithm-archivists/algorithm-archive/wiki/Code-style-guide. If you have suggestions, feel free to add them to #481.

Otherwise, approved!

[VincentZalzal]

Sorry, my comment was unclear. I meant, at least you provide a clang-format config, which handles much style issues already, which is nice. I used it before submitting :)