What is a good SI course or resource to prepare for an interview?

Question

C++ / C#

Good time!
I'll go for an interview the other day, they say the main emphasis should be on C. I myself work with C ++, so some things need to be repeated, and some things need to be learned.
Can you please tell me some good resource that you can quickly go through and refresh your memory?

Answer 1

Take - there is everything! You can even download the entire site with examples, tasks, and so on.
ermak.cs.nstu.ru/cprog/html

Answer 2

I wrote here (this is not a refresher, but the central documentation)
Where can I find out about libraries?