Computing PI

simon10k · 2006-06-08T16:05:20

I know PI is approx 3.142... but how did "they" work that out? I don't think it was with a string and a ruler, unless it was a very big circle. I heard somewhere that there was a computer program working out the defininate value of PI, that it is a very long number and doesn't seem to have an end. How could I conjure up something in C++ to compute the value of PI without a constant, or just typing it -for learning purposes.

Math and Physics Programming

Started by simon10k May 24, 2006 05:28 AM

9 comments, last by alvaro 17 years, 10 months ago

alvaro

21,604

June 08, 2006 04:05 PM

Try this!

#include <stdio.h>int a=10000,b,c=35000,d,e,f[35001],g;int main(){  for(;b-c;)f[b++]=a/5;  for(;d=0,g=c*2;c-=14,printf("%.4d",e+d/a),fflush(stdout),e=d%a)    for(b=c;d+=f*a,f=d%--g,d/=g--,--b;d*=b);}