calc/custom/CUSTOM_CAL

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# Copyright (c) 1997 Landon Curt Noll
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The following custom calc library files are provided because they serve
as examples of how use the custom interface.  The custom interface
allows for machine dependent and/or non-portable code to be added as
builtins to the calc program.  A few example custom functions and
library files are shipped with calc to provide you with examples.

By default, the custom builtin returns an error.  Calc have been
built with:

	ALLOW_CUSTOM= -DCUSTOM

in the top level Makefile (this is the shipped default) and calc
must be invoked with a -C argument:

	calc -C

when it is run.

See the ../lib/README or "help stdlib" for information about
calc library standards and guidelines.

=-=

halflen.cal

    halflen(num)

    Calculate the length of a numeric value in HALF's.