STDIN, STDOUT, STDERR 
STDIN, STDOUT, STDERR
 
These three file pointers are 
automatically defined when a program
executes and provide access to the keyboard and screen.
stdin
By default stdin accesses the keyboard. Functions that read 
stdin include...
The following functions can access stdin
 stdin example program.
stdin example program.
stdout
stdout sends data to the screen. Functions that write to stdout
include....
stderr
stderr also writes to the screen. If you are using a Unix based system
the data sent to stdout and stderr can be seperated and sent to 
different places.
Functions that could write to stderr include...
If you wish to create file pointers to perform I/O to other devices 
you should use fopen
Martin Leslie