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

int
main(int argc, char *argv[])
{
    time_t t0, t1;

    t0 = time(NULL);
    printf("t0=%ld\n", (long) t0);

    printf("wait 5 secs");
    fflush(stdout);
    sleep(5);

    t1 = time(NULL);
    printf("\rt1=%ld\n", (long) t1);

    printf("difftime(t1, t0)=%.3f\n", difftime(t1, t0));
    exit(EXIT_SUCCESS);
}