c/pia.c

   1 #include <stdio.h>
   2 #include <math.h>
   3 #include <time.h>
   4 #define PI 3.141592653589793
   5 #include <termios.h>
   6 #include <sys/ioctl.h>
   7 #include <stdlib.h>
   8 #include <unistd.h>
   9
  10 int main(void) {
  11   //get size of terminal
  12   int lines = 20;
  13   int cols = 20;
  14   /*FILE *p;
  15   p = popen("stty size", "r");
  16   fscanf(p, "%d %d", &lines, &cols);
  17   close((int)p);*/
  18   struct winsize ws;
  19   if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
  20     ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
  21     ioctl(STDIN_FILENO,  TIOCGWINSZ, &ws) == -1) ||
  22     ws.ws_col == 0) {
  23       lines = 25;
  24       cols = 80;
  25   } else {
  26     lines = ws.ws_row;
  27     cols = ws.ws_col;
  28   }
  29
  30         char *format;
  31         asprintf(&format,"%%0.%dlf\r",cols-2);
  32
  33
  34   double pi=0, i=1;
  35
  36         while(1) {
  37                 printf(format, pi);
  38                 pi+=(4/i);
  39                 i+=2;
  40                 pi-=(4/i);
  41                 i+=2;
  42         }
  43   //system("PAUSE");
  44   //return EXIT_SUCCESS;
  45 }