Depends on what sort of stuff they learned - remember that those students knew nothing about C so they'd be learning very simple stuff.

As an example, the free version of Turbo C++ 1.01 that is available through the Borland/Embarcadero museum (or was at some point, i don't know if still is) has ~34 introduction examples (referenced via their guide) that outside of a couple, use only basic stdio and stdlib stuff (these 2-3 examples that use a non-standard header use conio.h which AFAIK is borland specific, though Watcom/OpenWatcom and Visual C++ also seem to provide the used functions) without any DOS-specific functionality (be it far pointers or whatever) and could compile with any modern compiler.