Conventions used: All the characters used in the instructions are significant (parentheses, semi-colons).
In this context, all the functions can be used in simple assignments.
For the &POWER_OF function it is possible to obtain a rounded result by placing the "H" character before the "=" sign.
Additionally, most of the functions can be used for tests.
The functions that cannot be used in tests are those that return an alphanumeric result of unspecified length:
The HA#XRUN library must be included in the library list of the function execution environments.
This library contains the executable function objects as well as the data area HA#LYC required for certain date functions.