Readable C Program to Compute Pi DigitsPublic

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GPT-5.3 Codex

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Mar 24, 7:05 PM

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Summary

please create the smallest (lines-of-code) way to calculate the number Pi to the n's digit. n is a parameter and the program should be in C

Here’s a tiny C program (single line in main) that prints π with n digits after the decimal point:

Compile and run:

bash

This is very short, but note: precision is limited by long double (so it won’t give thousands of correct digits).

i need unlimited precision

For arbitrary precision in C, the shortest practical way is to use MPFR (with GMP under the hood).

Build

bash

Run

bash

This gives n digits after the decimal point, with precision limited only by memory/time (i.e., arbitrary precision).

by low number of codes i didn't mean jam everything on one line. the code should still be readable.. also can you avoid using any external libraries. just use pure C and algorithm

Great constraint 👍 — readable, pure C, no external libs, arbitrary number of digits (limited by time/RAM).

This uses a classic spigot algorithm for π:

Compile/run:

bash

If you want, I can also give an even shorter version (still readable) with fewer checks/comments.

ok write the program to disk pls

Done — I wrote it to:

pi.c

You can compile and run with:

bash