Just for restoring my reputation:
I know those rules already and I know how to apply them

A computer might implement checking the conditions in a different way though.
It might check all conditions for truth and state the result afterwards.
Or it might be implemented to do something like an IF-ELSEIF-ELSE chain would do, meaning if it hits first it sticks to it. Why should a computer test more than one condition if the "true"-outcome has already been reached?

I have seen such implementations before. This of course saves CPU cycles noticably only for large numbers of repetitions. It all depends on the implementation of the checking routine.

And this I have learned AFTER school in university lectures about algorithms and data structures )