Simple code that calculates and looks like Pi...

pi.c

#include <stdio.h>
#include <inttypes.h>

int main(){uintmax_t step=0;
long double pi=4.0L;while(1)
  {pi+=             4.0/ (
  3.0L+             step *
  2.0L)             *(   (
  step%             2==0 )
  ?-1:1             );step
  ++;if             (step%
  (int)             1.00e6
  ==0 )             printf
  ("\r"             "%.40Lf"
 " - %e "           "steps",pi,
 (double)             step ); } }