Nothing special to do here, the code is your content. You mark up your code with appropriate elements, and consumers (like search engines) then can do whatever they want to do with this information. A code search engine might be especially interested in it, other search engines might ignore it, most will probably don’t care and handle it in the same way like non-code content.
You should use the
code element, for blocks of code as well as inline code, just like I did in this very sentence (see example).
If you have a block of code where the formatting (i.e., multiple lines, indentation) matters, you should use the
pre element in addition to
code (see example).