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

struct timeval tv[100];
struct timezone tz;                     

main() {
   int i;
   double a = 5.3;
   long tv_sec, tv_usec;
  

   tv_sec = floor(a);
   printf("floor(a)=%f\n", floor(a)); 
   tv_usec = (a - floor(a))*1000000;
   printf("tv_sec=%d, tv_usec=%d\n", tv_sec, tv_usec);
 
   for (i=0; i<50; i++) {
     gettimeofday(&tv[i], &tz);
   } 
   for (i=0; i<50; i++) {
     printf("tv_sec=%d, tv_usec=%d\n", tv[i].tv_sec, tv[i].tv_usec);
   } 
}