#include <stdio.h>
#include <time.h>
#include <unistd.h>
int main(void)
{
time_t starttime = time(NULL);
time_t seconds = 3;
time_t endtime = starttime + seconds;
while (starttime < endtime) {
sleep(1);
starttime = time(NULL);
printf("%s", ctime(&starttime));
}
return 0;
}
/*
run:
Sat Nov 30 22:19:08 2019
Sat Nov 30 22:19:09 2019
Sat Nov 30 22:19:10 2019
*/