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How to make a timer in C Programming?

–1 vote
asked Nov 25, 2020 by Superman365 (500 points)

Hope for a quick answer

Can we make a timer that will repeat forever and keep going? I want it to go like:

Please type the seconds and minutes:(Hrs:mins:secs)

(Then the countdown)

(After countdown:)

Countdown complete!

1 Answer

+1 vote
answered Nov 25, 2020 by Peter Minarik (22,520 points)
edited Nov 26, 2020 by Peter Minarik

Code Snippet

Have a look at this: https://stackoverflow.com/questions/17167949/how-to-use-timer-in-c

Update

I've turned the code snippet into a working program:
#include <time.h>
#include <stdio.h>

int main () 
{
    int iterations = 0;
    int msec = 0, trigger = 10; /* 10ms */
    clock_t before = clock ();
    do
    {
        printf("doing some heavy work here...\n");
        for (int i = 0; i < 1000000; i++) /* no operation */;
        /* Do something to busy the CPU just here while you drink a coffee
         * Be sure this code will not take more than `trigger` ms */
        clock_t difference = clock () - before;
        msec = difference * 1000 / CLOCKS_PER_SEC;
        iterations++;
    } while (msec < trigger);

    printf ("Time taken %d seconds %d milliseconds (%d iterations)\n", msec / 1000, msec % 1000, iterations);
    return 0;
}
commented Nov 25, 2020 by Superman365 (500 points)
It is showing incorrect. I mean there are errors.
commented Nov 26, 2020 by Peter Minarik (22,520 points)
What I linked was just a code snippet, not a fully working program. It is just a fragment of code. It still needs to be put into a function, have the right header files included, etc.
commented Nov 26, 2020 by Superman365 (500 points)
Oh! Ok. I get it now. But I am beginner. So I need the whole code.
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