#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main(int argc, char const *argv[])
{
	int p1=fork();
	if (p1==0)
	{
		/* code */
		for (int i = 0; i < 2; ++i)
		{
			/* code */
			printf("child: %d\n",getpid());
		}
	}else if(p1>0){
		int p2=fork();
		if(p2==0){
			for (int i = 0; i < 3; ++i)
			{
				/* code */
				printf("child: %d\n",getpid());
			}
		}else if(p2>0){
			for (int i = 0; i < 4; ++i)
			{
				/* code */
				printf("parent: %d\n",getpid());
			}
		}else{
			printf("Failed to create p2.\n");
			exit(1);
		}
	}else{
		printf("Failed to create p1.\n");
		exit(1);
	}
	return 0;
}