This mysterious 3.1415926..., This we all remember, at least the first seven decimal places 😅  π  = 3.1415926535897932384626433832795028841971693993751... The ratio of the circumference of a circle to its diameter.   1) One of Archimedes many significant contributions to mathematics was his approximation of the value of π He was the first mathematician to establish a theoretical calculation for π instead of an estimation. By inscribing and circumscribing polygons on a circle, he was able to constrain the value of π between 3+10/71 and 3+1/7.
This mysterious π 3.141592..., which comes in at every door and window, and down every chimney.
Augustus De Morgan (1806-1871)

The following tiny C code computes digits of π   (Boris Gourevitch)
```                    main() {
int a=10000,b,c=8400,d,e,f[8401],g;
for(;b-c;)f[b++]=a/5;
for(;d=0,g=c*2;c-=14,printf("%.4d",e+d/a),e=d%a)
for(b=c;d+=f[b]*a,f[b]=d%--g,d/=g--,--b;d*=b);
}
```
1) Wolfram Mathworld

#### C -code to calculate the value of π

Tested on Ubuntu 20.04 Linux Kernel 5.4.0-104-generic (16.3.2022)
Requires libgmp3-dev library
Ubuntu: apt install libgmp3-dev

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