Fan of Process

#include<stdio.h>
#include<sys/types.h>
#include<unistd.h>
int main()
{
int i;
int n=10;
pid_t childpid;
for(i=1;i<n;++i)
if((childpid=fork())<=0)
break;
fprintf(stderr,"this is process %ld with parent %ld\n",(long)getpid(),(long)getpid());
}