/* Circolarizzazione del quadrato - Dario Tratzi ©2026 */



#include <stdio.h>

#include <math.h>



main()

{

   unsigned long n;

   double pi=3.141592653589793;

   FILE *ptr;



   ptr = fopen ("pi.txt", "w");



   for (n = 4; n < 1000000; n++)

      {

      printf ("Lati %d p %.15f 2*pi*1 %.15f\n", n, 2*(double)n*1*sin(pi/(double)n), 2*pi*1);

      fprintf (ptr, "Lati %d p %.15f 2*pi*1 %.15f\n", n, 2*(double)n*1*sin(pi/(double)n), 2*pi*1);

      }



   fclose(ptr);

}