#include <stdio.h>
/* has the definition of pid_t */
#include <sys/types.h>
/* The <unistd.h> header defines miscellaneous symbolic constants and types, and declares miscellaneous functions. Like fork()*/
#include <unistd.h>
#include <time.h>
int randomNumber;
int main ()
{
    int i;
    pid_t parent_id=getpid (), child_pid;
    /* initialize random seed: */
    srand(time(NULL));
    randomNumber = rand()%1000;
    printf ("The main program process ID is %d\n", (int)parent_id);
    /*The fork() function creates a new process. The new process (child process) is an exact copy of the calling process (parent process).*/
        for (i = 0; i< 10 && getpid () == parent_id;i++)
        	child_pid = fork ();
        if (child_pid != 0) {
            printf ("This is the parent process, with id %d ", (int) getpid ());
            printf ("and my child’s process ID is %d\n", (int) child_pid);
        }else{
            printf ("This is the child process, with id %d and RANDOM %d\n", (int) getpid (), ++randomNumber);
            
        }
    return 0;
}