More than one conditional compilation symbols?

Question

I have a question regarding conditional compilation symbols in Visual Studio (my version is 2017).

Assuming that I have two compilation symbols, e. g.:

#if new_version
#if old_version

then in what typing should I put them in Project properties ->Build ->Conditional compilations symbols:

1) new_version, old_version

2) new_version;old_version

3) new_version; old_version

4) new_version,old_version

5) other options?

Any suggestion which way is correct?

Answer 1

Use semi-colons, but I would think with names like new_version and old_version that you would generally only define one of them.