#include <stdio.h>

main()
{
  int tochild[2], fromchild[2];
  double d;
  char buf[11];

  if (pipe(tochild) < 0) { perror("pipe"); exit(1); }
  if (pipe(fromchild) < 0) { perror("pipe"); exit(1); }
  
  if (fork() == 0) {
    close(tochild[1]);
    close(fromchild[0]);
    if (dup2(tochild[0], 0) < 0) { perror("dup2"); exit(1); }
    if (dup2(fromchild[1], 1) < 0) { perror("dup2"); exit(1); }
    close(tochild[0]);
    close(fromchild[1]);
    execlp("ticker", "ticker", NULL);
    perror("execlp ticker");
    exit(1);
  } else {
    close(tochild[0]);
    close(fromchild[1]);
    while(1) {
      sleep(1);
      if (write(tochild[1], "\n", 1) != 1) exit(1);
      if (read(fromchild[0], buf, 10) != 10) exit(1);
      buf[10] = '\0';
      sscanf(buf, "%lf", &d);
      printf("%.5lf\n", d);
    }
  }
}