/*
 * san2(at)linuxchannel.net
 */

#include <stdio.h>
#include <sys/time.h>

double microtime(void);

#define NUL  '\0'
#define MICRO_IN_SEC 1000000.00
#define SEC_IN_MIN 60

int main()
{
  double s, e;

  s = microtime();
  e = microtime();

  printf("%.8f\n",s);
  printf("%.8f\n",e);

  printf("%.8f\n",(e-s));

  return;
}

double microtime(void)
{
  struct timeval tp;
  long sec = 0L;
  double msec = 0.0;
  double tsec = 0.0;

  if (gettimeofday((struct timeval *) &tp, (NUL)) == 0)
  {
        msec = (double) (tp.tv_usec / MICRO_IN_SEC);
        sec = tp.tv_sec;

        if (msec >= 1.0) msec -= (long) msec;
        tsec = msec + sec;
  }

  return tsec;
}