%                Expression Operator                                 Operator

  %text

    Causes the assembler to treat text as an expression. The assembler will
    compute the expression's value using the current radix, and replace text
    with the new value.

       Notes:     This operator is usually used when calling macros and
                  the value to be passed to the macro is the result of an
                  expression, rather than the actual expression.

                  Text must be a valid expression in the current radix.