Question

How to run while loop for N seconds in C

Answer 1

#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
     
*/

 

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