Pi Approximation Day

[Valentin Albillo]

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Hi, all,

I can't let Pi Approximation Day (22/7) pass by without my humble contribution, so here you are.

Set FIX 6 and then run on your HP-42S (physical or virtual) this little piece of mystery code I've hastily concocted and see what you get:

01 LBL "?"
02 10
03 STO ST Y
04 LBL 00
05 RCL ST Y
06 RCL× ST Z
07 RCL+ ST Z
08 RCLx ST X
09 RCL× ST L
10 1/X
11 -
12 DSE ST Y
13 GTO 00
14 SQRT
15 END

See if you can fathom how/why it works.

Regards.
V.