Is it allowed to use C functions in C++?

Question

C++ / C#

I don't know much yet, so this might be a dumb question. Is it bad form to use functions from C in C++ programs? Are there any downsides to using such functions? I asked this question because I needed to get the current date, but using functions from the C library, the compiler said that using a function / variable could be unsafe and suggested using another one. For a detailed explanation or links to articles (English or Russian), a separate huge thank you.

Answer 1

You can talk for a long time about bad style or the difference between programming paradigms.
You can holivar, or you can know that no one will ever see 90% of the code.
You can also remember that the author himself called C ++ "C with classes".
So yes, you can.

Answer 2

Read about mangling, maybe it's all about it.

Answer 3

Yes, you can, there is even a style where C++ does not use C++, only from c.

Answer 4

Although C++ has already gone far from "C to classes", but it is possible, compilers are backwards compatible. Just be careful.

Answer 5

as a first approximation, you use them constantly declaring a static class method