2.5.1 Arithmetic Operators
Arithmetic operators can be applied to numeric constants and Rexx
variables that evaluate to valid Rexx numbers.  The following
operators are listed in descreasing order of precedence:

     -         Unary prefix. Same as 0 - number.
     +         Unary prefix. Same as 0 + number.
     **        Power
     *         Multiply
     /         Divide
     %         Integer divide.  Divide and return the integer part
of the division.
     //        Remainder divide.  Divide and return the remainder
of the division.
     +         Add
     -         Subtract.


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