Your challenge is to take a classic RPN machine in an unknown stack circumstance and generate a 64 in the X register.
You may not use any of the digit keys 0 - 9, the EEX key or the decimal point.
Who can come up with the shortest set of steps ?
9 steps on an 11C - the most obvious method so I expect to be beaten!
9 steps HP 42s ... how to get to five.....
According to
https://hpmuseum.org/ none of the entries so far are from "The Classics".
On an HP 41-cx I can do this in 4 program steps.
.
7 steps in the HP-25, no modes or contents assumed.
V.
25C 8 steps
41c 5 steps
Günter
(09-02-2020 10:49 PM)Craig Bladow Wrote: [ -> ]According to https://hpmuseum.org/ none of the entries so far are from "The Classics".
On an HP 41-cx I can do this in 4 program steps.
Yes, the “Classics” encompass only the HP-35, HP-80, HP-45, HP-65, HP-70 and HP-55. Perhaps I can use part of my sequence on the HP-65, but then again I assume Gene’s solution should work on all Classics.
(09-02-2020 10:56 PM)Gerson W. Barbosa Wrote: [ -> ]Yes, the “Classics” encompass only the HP-35, HP-80, HP-45, HP-65, HP-70 and HP-55.
Are you implying that the
HP-25 isn't a
classic !!?? C'mon, Gerson !
V.
(09-02-2020 11:09 PM)Valentin Albillo Wrote: [ -> ] (09-02-2020 10:56 PM)Gerson W. Barbosa Wrote: [ -> ]Yes, the “Classics” encompass only the HP-35, HP-80, HP-45, HP-65, HP-70 and HP-55.
Are you implying that the HP-25 isn't a classic !!?? C'mon, Gerson !
I consider even the more recent HP-15C, my first one, a Classic. The above is the curator’s definition.
Best regards,
Gerson.
(09-02-2020 11:24 PM)Gerson W. Barbosa Wrote: [ -> ] (09-02-2020 11:09 PM)Valentin Albillo Wrote: [ -> ]Are you implying that the HP-25 isn't a classic !!?? C'mon, Gerson !
I consider even the more recent HP-15C, my first one, a Classic. The above is the curator’s definition.
Yes, but we aren't dealing here with
"the curator's definition". Notice that Gene's OP literally says (my
underline):
"Your challenge is to take a classic RPN machine [...]"
with no quotes around
"classic", no capitalization
"Classic", no underline of course, and no reference to the curator's
"The Classics (1972)".
Best regards.
V.
By "classics" I merely meant to exclude the WP-34S, the 71B, the RPL machines etc.
Gene
HP42s - 5 steps
Edit: 4 steps
Edit 2: 3 steps
(09-03-2020 04:43 AM)Mark Hardman Wrote: [ -> ]HP42s - 5 steps
Edit: 4 steps
Edit 2: 3 steps
In the
HP42s and some models of the 41 it can be done in
2 steps.
V.
Gene: 'generate a 64 in the X-register'
.. that is not quite the same as saying 'generate the number 64 in the X-reg', is it?
in that case:
41C: 3 steps
Werner
Yes, 2 steps and 4 bytes on the HP-42S. Only because now I know it is possible.
How about the smallest number of keystrokes?
I thought that was what Gene meant, actually, and the minimum number of program steps does seem to be a bit too easy. On the 42S anyway.
(09-03-2020 05:23 AM)Valentin Albillo Wrote: [ -> ]In the HP42s and some models of the 41 it can be done in 2 steps.
Agreed! (2 steps, 4 bytes)