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cctime

Get interval between 2 operations using ctime?

I am interested in showing the execution time for a program in C, at diverse points, using ctime. I have tried something like that, but it must not be right...

int main() {

    time_t tm1, tm2;
    tm1 = time(NULL);
    sleep(2);
    tm2 = ctime(tm1);

    printf("%d\n", tm2-tm1);
    return 0;
}

Do you have any suggestion or a proper example? Thanks in advance

Solution

  • ctime() returns a string representation of the time passed into it.

    If you want a simple elapsed time, just:

        time_t t1, t2;
    t1 = time(0);
    sleep(2);
    t2 = time(0);

    printf("Elapsed: %d\n", t2 - t1);

    See man ctime and man 2 time.