the basics is to select one digit and at thet time provide the segment display data for that digit.

here is another statement that (maybe unintentionally) say "there is only on way to do it"

such posts should start "I use ...", "one way to...", "I suggest ..." or similar.

Readers of such post may very well end up propagating the false "only one way" approach.

The same goes for "sample code" (usually a veiled form of "give me the code") which again will lead someone to propagate whatever inefficiencies or misconceptions such code contains.

Erik