Hi there,

when i was searching on a program to calculate somehow close fractions or, even better, show a close pi or sqrt value i found this program:

https://www.hpmuseum.org/software/qpi/42sqpi.htm

Now I'm curious if the behavior on the DM42 is different then on the HP42s.

Because I do net get e.g. sqrt(2) or -sqrt(2) as result. As well I do get values with pi up to 4*pi. But with 5*pi it gives a "normal" fraction. Is this the same on the original HP42s?

Can I modify the code to work as intended on the DM42?

I think this is a very useful program.

Best regards

Friedrich

## Calculate closest fraction or sqrt...

### Calculate closest fraction or sqrt...

HP-41cx, HP-35s, DM42

### Re: Calculate closest fraction or sqrt...

For whatever reason, the QPI program is dependent on the set DISP. Therefore I have configured FIX 06 as default.

DM42 SN:00032

### Re: Calculate closest fraction or sqrt...

Ah, yes, you are right! If I go to more digits it becomes better. Is it possible to change that behavior?

HP-41cx, HP-35s, DM42

### Re: Calculate closest fraction or sqrt...

I thought that was deliberate, to allow you to set the required accuracy?

Cambridge, UK

41CL 12/15C/16C DM15/16 71B 17B/BII/bII+ 28S 42S/DM42 48GX 50g 35s 30b/WP34S Prime G2

& Casios, Rockwell 18R

41CL 12/15C/16C DM15/16 71B 17B/BII/bII+ 28S 42S/DM42 48GX 50g 35s 30b/WP34S Prime G2

& Casios, Rockwell 18R