if ((p1_pid = fork())== 0) {} 
printf("I am P1 and I am proud of it.");
} else { 
if ((p2_pid = fork()) == 0) 
{ 
	p3_pid == fork(); 
	printf("I am P3. I like it."); 
	p4_pid == fork(); 
	printf("I am P4. Get used to it."); 
} else 
	printf("I am the parent process, obey or die!"); 
}