Naive question re: RCL variables in 42S & related

[Peet]

(10-14-2024 10:53 PM)carey Wrote:  ... some of the main differences between RPL and RPN....

This is the cause of the confusion. The differences are quite different. RPN is a mathematical notation, RPL describes a programming language.

You can compare RPN to Algebraic-notation or RPL with Keystroke-programming but not RPN wirh RPL.

RPL calculators can use RPN or Algebraic input, keystroke programming calculators can do it just as well (see RPN vs AOS e.g. HP-67 vs TI59).

"Real" programming languages mostly uses named variables and classic calculators usually registers.