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

int main(void)
{
    	pid_t pid;
    	if((pid=vfork())<0)
	{
    		printf("fork error! \n");
    		exit(1);
	}
	else if(pid==0)
	{
    		printf("Child process is printing.\n");
	}
	else
	{
    		printf("Parent process is printing.\n");
	}

	exit(0);
}