Find the largest number from a set of define and set a define from the answer

If experts would generalize their, um, expertise it would be hekpful.

What and how much can be done along these lines at compile time?

I once heard of a macro pre-processor so able it could be hacked to play a game of tick-tax-tow with the user who invoked the assembler on it. Dunno if the program it made was significant.

Probably beyond the C/C++ preprocessors, but it reminds me that it can do many things I haven’t even dreamt of.

TIA

a7