Toy copy
========

Someone it has been said that every program starts as **cat**, which
copies standard input to standard output.  It's one of the first
programs in Kernighan and Ritchie.

.. literalinclude:: /../../toyproblem/toycopy.p
   :language: pascal

The challenge is to restructure this program so that i/o can be sent
to whereve we want.


Here we've rewritten the program to use external routines for the i/o.
Note that we've had to change the program logic slightly, because in C
the EOF occurs only when we 'read past the end'.

.. literalinclude:: /../../toyproblem/toycopy2.p
   :language: pascal


And here we've implemented these external routines.

.. literalinclude:: /../../toyproblem/toycopy2_io.c
   :language: c