Using printf & scanf with pipe() ?

[Stellan Alm]

Hi,
I'm doing an asignment in school, and have to use printf and scanf to
talk
between mother and child.
I can't find any documentation about this.
It works fine with read() and write(),  but how do I know which
filedescriptor to use
when I doing it with  scanf  and printf  ?
Is it possible to send a whole string or do I have to take each
character by them selve ?
Did I mention that the message is sent from the child to the mother ?

Stellan Alm
<[EMAIL PROTECTED]>
Sweden