programmermattc, that depends on what incarnation of Wolfenstein we are talking.

First, C is much older than C++, so C may be possible.

There were some old games for the C64 around 1983 or 1984, but I doubt those are the ones written in C. C compilers were not very practical to use on the old 8 bit machines. You need at least two floppy disk drives and at that time the capacity of the disks would also have been an issue and hard disks were very uncommon and expensive.

Then there is Id's Wolfenstein 3D from around 1991. This one can very ´likely have been written in C.

As for the newer ones - C is possible, but I would guess that C++ is more likely