calculating Pi

[wengang]

Hi.
I have read up on a number of ways to have an app calculate pi, but I keep coming back to the same hard limit. Pretty much every app I know of in Windows stops adding decimal places after about 10.
If I wanted to calculate Pi to 1000 decimal places, the algorithm is just going to round to the nearest billionth (or whatever). What am I missing?
How are computers getting pi into the trillions of digits?

[dilettante]

Maybe try a search for bignum?

[baka]

https://cs.uwaterloo.ca/~alopez-o/ma...xt/node12.html

[dday9]

Because this is more of a math question than it is a VB6 question, I have moved the thread to the Maths Forum.

[VBAhack]

Hi.
I have read up on a number of ways to have an app calculate pi, but I keep coming back to the same hard limit. Pretty much every app I know of in Windows stops adding decimal places after about 10.
If I wanted to calculate Pi to 1000 decimal places, the algorithm is just going to round to the nearest billionth (or whatever). What am I missing?
How are computers getting pi into the trillions of digits?

You need to use software that has extended precision capability, like the Python mpmath module, or FLINT:

https://mpmath.org/
https://flintlib.org/

Years ago there was an extended precision Excel add-in called XNUMBERS that could make computations up to 200 digits or more, but development stopped at some point:

https://www.thetropicalevents.com/Xnumbers60.htm