struct timeval tx;gettimeofday(&tx,NULL);srand(tx);int flag =rand() % 3;

&tx,NULL); This code snippet uses the gettimeofday() function from the <sys/time.h> header file to obtain the current time and store it in the timeval structure variable named tx. The gettimeofday() function is used for measuring time intervals with high precision. It returns the current time as the number of seconds and microseconds since the Epoch (January 1st, 1970 at 00:00:00 UTC). The NULL argument in the function call indicates that the timezone information is not required and can be ignored.