I think for a full understanding you should also be aware that the Arduino system has a great many predefined names (of which A0 is one example) which the compiler converts to numbers that are meaningful for the microprocessor.
...R
I think for a full understanding you should also be aware that the Arduino system has a great many predefined names (of which A0 is one example) which the compiler converts to numbers that are meaningful for the microprocessor.
...R