time example in C

Header file:

    time.h

Synopsis:

     time_t time(time_t *tp);

Description:

     Returns current calendar time if tp is NULL or returns -1 on failure.  If tp is not NULL, then the return value is assigned to *tp.

time function C example:

  #include<stdio.h>
  #include<time.h>
  int main() {
        time_t tp, ret;
        printf("time(NULL):%ld\n", time(NULL));
        sleep(5);
        ret = time(&tp);
        printf("Return value: %ld\ntp:%ld\n", ret, tp);
        return 0;
  }

  Output:

  jp@jp-VirtualBox:~/cpgms/time$ ./a.out
  time(NULL):1336234593
  Return value: 1336234598
  tp:1336234598