#include  <unistd.h>
#include  <stdio.h>
#include  <sys/types.h>

int main  () 
{
	pid_t  pid;
	pid=fork();
	if  (pid  <  0) 
		printf("error  in  fork!");
	else  if  (pid  ==  0)
		printf("i  am  the  child  process,  my  process  id  is  %d\n",getpid());
	else
		printf("i  am  the  parent  process,  my  process  id  is  %d\n",getpid()); 
}