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I always forget this one, so better keep a reminder here

How to display a C preprocessor output message:

#pragma message "Here!"

Checking several preprocessor defined values:

#if defined( VALUE1 ) || defined( VALUE2 ) || ...

For VC use pragma message like this:

#pragma message( "Here!" )

https://docs.microsoft.com/en-us/cpp/preprocessor/message?view=vs-2019