fork()

void Child(int, int, int);void Parent(int, int&);int main(){	int child = 0;	int i;	int r = 1;	i = 1;	int num = 0;	int parentid;	int child01 = 0;	int child02 = 0;	int pid;	 for(i=1; i < 2; i++)		  {		  cout << "Level\t Procs\t Parent\t Child1\t Child2\n";		  cout << "No.\t ID\t ID\t ID\t ID\n" << endl;		  }	// start main loop	 	 for(child = 0; child < 2; child++) {	 pid = fork ();	 	 //Parent Scope	   if (pid > 0)	   {		Parent(num, parentid);	   }	   //Child Scope	   else if (pid == 0)	   {		Child(r, child01, child02);	   }	   else if (pid < 0)	   {	     perror ("Can not create fork.");	     exit (1);	   }	 }	 cout << num << "\t" << getppid();	 cout << "\t" << parentid;	 }void Child(int r, int child01, int child02){	sleep(1);	child02 = getpid();	cout << "\t" << child02;		exit(1);}void Parent(int num, int& parentid){        parentid= getpid();}