HP-42s Entering 4 complex numbers on the stack

[Vincent Weber]

Hi,

I came up with a totally different approach. It gives up on real HP-42S compatibility and makes use of awesome Free42/Plus42 extensions:
-FUNC that allows user-defined functions with preserves the original stack;
-RCOMPLEX and PCOMPLEX with allow to enter a complex number in a different mode than the current rect/polar mode.
-Just launch, mess up with the stack without any fear, generate your complex number as usual (on 2 stack levels) and press either RECT or POLAR. Do it As much as you want (until you have 4 complex numbers on the stack) then press EXIT. Done.

I have always found the 35S One-line entry way cute, but limited: it will use one stack level... Only if you know exactly in advance the 2 parts of the complex number and key them in! But in most cases you need to build these parts with intermediate computations. Here you can use the stack as a scratch pad before entering a new complex number, the stack will remain intact. Cute, isn't it? Even more so than on the 15C!

If you want to to use a real HP 42S you can use variables to save and restore the stack registers, and conversions to enter in a different rect/polar mode.

00 { 59-Byte Prgm }
01▸LBL "RC"
02 CLMENU
03 "RECT"
04 KEY 1 XEQ 02
05 "POL"
06 KEY 6 XEQ 03
07 KEY 9 XEQ 99
08 MENU
09▸LBL 04
10 XEQ 01
11 GTO 04
12 RTN
13▸LBL 02
14 RCOMPLX
15 RTN
16▸LBL 03
17 PCOMPLX
18 RTN
19▸LBL 01
20 FUNC 01
21 STOP
22 RTN
23▸LBL 99
24 CLMENU
25 EXITALL
26 RTN
27 END