Gerson's Pi Program

[EdS2]

Did anyone else have a go at de-obfuscating and running Gerson's short pi-calculating program from the festive greetings thread?

(12-25-2020 11:45 PM)Gerson W. Barbosa Wrote:  

I'd be interested to know how it works!

I made a plain copy in BBC Basic, which you can run in your browser here.

And here it is below anti-spoiler scroll filler:

Code:


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10 INPUT n
20 c=0
30 d=8*n+4
40 e=d-8
50 m=4*n*n - 1
60 w=2
70 FOR i=1 TO n
80 w=w+w/m
90 c=m/(c+d)
100 m=m-e
110 e=e-8
120 NEXT
130 PRINT w*(2/(c+d-1)+1)