/* time_of_day      just print day/month/year  hour:minute:second */
/*                  also get CPU time as double precision floating point */

/* #define CLOCKS_PER_SEC (1000000) */ /* for SIGPRO */
#include <time.h>   /* in past might be <sys/time.h> */
#include <string.h>
#include <stdio.h>

int main()
{
  struct tm *today ;
  time_t   my_time;
  char ascii_string[100];
  double  cpu_time;
  int i, j;

  cpu_time = (double)clock() / (double)CLOCKS_PER_SEC;
  printf(" %g CPU time \n", cpu_time);

  my_time = time(&my_time);
  today = localtime(&my_time);
  strcpy(ascii_string, asctime(today));

  printf(" %d / %d / %d \n", today->tm_mday, today->tm_mon+1, /* fix */
                                             today->tm_year+1900);
  printf(" %d : %d : %d \n", today->tm_hour, today->tm_min, today->tm_sec);
  printf(" ascii string %s \n", ascii_string);

  /* waste time to get non zero CPU time */
  cpu_time = 1.0;
  for(j=0; j<1000; j++)
  {
    for(i=0; i<10000; i++)
    {
      cpu_time = 3.2*cpu_time-1.001*(2.99*cpu_time-0.001/cpu_time);
    }
  }
  printf("waste time %g \n", cpu_time);
  cpu_time = (double)clock() / (double)CLOCKS_PER_SEC;
  printf(" %g CPU time \n", cpu_time);

  return 0;
}

/* output:
 0 CPU time 
 22 / 4 / 96 
 2 : 59 : 33 
 ascii string Mon Apr 22 02:59:33 1996
 
waste time 0.035529 
 5.82 CPU time 
*/