HP 50g Binary Number Formatting

[Gil]

Great indeed all the refined solutions proposed.

Beyond my basic level, indeed.

About mine, for which it seems easier to follow the steps:

I considered a string of digits only such as
"1111001".

If you have instead a character at the beginning and another one at the end,
such as "A1111001B",
you will have to cut them off (the A and B in the example sbove) before launching the program.

Add rather then the following instructions
DUP SIZE 1 - 2 SWAP SUB
at the very beginning of my program —>BIN4c