printf to pipe

I am trying to figure out how pipes work so I have this code:

Code:

---

int main(){
        int fdpipe[2];
        pipe(fdpipe);
        if(fork()!=0){//parent
                dup2(fdpipe[1],1);
                close(fdpipe[0]);
                printf("mplamplampla\n");
                int status;
                waitpid(-1,&status,0);
        }
        else{
                dup2(fdpipe[0],0);
                close(fdpipe[1]);
                char buf[100];
                read(stdin,buf,7);
                printf("read from input:%s\n",buf);
        }
}

---

what i am trying to do is having the parent process write something to the pipe and child process read from the pipe. But the child process just hangs without printing any output.
Now, if i change the

Code:

---

printf("mplampla\n")

---

with

Code:

---

write(1,"mplampla\n",10);

---

works fine. child prints:
read from input:mplampla

Isn't printf writing to file with filedescriptor 1, output?
thanks

You probably need to use

Code:

---

  fclose(stdout);
  stdout = fdopen(1);

---

http://www.hmug.org/man/3/fdopen.php

--
Mats