m must include <TT>*eusdir*/c/eus.h</TT>.
The programmer should be familiar with the types and macros
described there.
The entry function should be named by the basename of the source file.

<P>
A sample code for C function AVERAGE which computes the arithmetic
average of arbitrary number of floats is shown below.
In this example, you can see how to get float values from arguments,
how to make the pointer of a float,
how to set a pointer in the special variable AVERAGE,
and how to define a function and a sy