using namespace std;
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
int main(int argc, char * argv[])
{
	int pid;  
	pid = fork();  
	if (pid == 0)  {                    
		printf("I am the child, my process id is %d\n",getpid( ));
		printf("the child’s parent process id is %d\n",getppid( ));
  		sleep(20); 
 		printf("I am the child, my process id is %d\n",getpid( ));
 		printf("I am the child, parent's  process id is %d\n",getppid( ));
	} else 
	{ 
 		printf("I am the parent, my process id is %d\n",getpid( ));
 		printf("the parents parent process id is %d\n",getppid( ));
	}
}