#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <unistd.h>

/* Acceleration due to gravity */
#define g 9.81

int main ()
{
   int h, smf;
   double d, t, t1;

   /* Input from the user */
   printf("Enter height: "); scanf("%d", &h);
   if ((h <= 0) || (h > 100)) h = 10;
   printf("Enter slow motion factor (1 <= smf <= 10): "); scanf("%d", &smf);
   if ((smf < 1) || (smf > 10)) smf = 5;

   t1 = 0;                                          /* Previous printing time */
   printf("         Time   Distance    Speed\n");
   for (d=0; d<=h; ++d) {                       /* For each one meter covered */
      t = sqrt(2*d/g);                               /* Current printing time */
      usleep(smf * 1000000 * (t - t1));     /* Wait until print is to be done */
      printf("  +++  %lf %5d %12.6lf\n", t, (int)d, g*t);            /* print */
      t1 = t;  /* Current print time is previous print time in next iteration */
   }
   printf("!!!! BANG !!!! BANG !!!! BANG !!!!\n");

   exit(0);
}