Can we use Turbo c++

Answer 1

If you are talking in terms of Code Playground, then no. It isn't supported here. There are also reasons why it shouldn't be used.

https://www.sololearn.com/Discuss/288609/?ref=app

That said, you may have better reasons to use it which outweighs the cons (?), who knows.

Answer 2

Why not. You should emulate it in dosbox. But do not forget that language itself had gone through development in time. So some features are missing.
/edit
Btw it is only 16bit i think. so app should be small