HP-65 Financial Software request

[Dave Britten]

(01-07-2019 05:48 PM)Dieter Wrote:  And finally here is another way of handling input and output with the same label keys: The COMPUTE key, which can be found on some classic, vintage HP65 programs.


Initialize (clear all three values) with [E].
Enter cost at [A], price at [B] and margin at [C].

To compute a value use the same keys preceded by [D]. This is the "compute" key. ;-)

That's a clever way of doing it. Sharp and TI financial calculators work that way. You could probably simplify this further by using R/S as the "compute key", and pressing it after the variable key. Something like this:

Code:

LBL A
STO 0
R/S
...compute value for A-key variable here...
GTO A

So you'd press A, R/S to calculate A. The value stored by pressing A could either be ignored, or used as an initial guess for an iterative solver.