math
----
Mathematical expressions.
::
math(EXPR )
``EXPR`` evaluates mathematical expression and returns result in the
output variable. Example mathematical expression is ``5 * (10 + 13)``.
Supported operators are ``+``, ``-``, ``*``, ``/``, ``%``, ``|``, ``&``,
``^``, ``~``, ``<<``, ``>>``, and ``(...)``. They have the same meaning
as they do in C code.