.LP 
Valid expressions may include the following standard 
arithmetic operators:
.LP
.nf
\f(CW
"*"      Multiply - multiple the two expressions together
"/"      Divide   - divide the second expr from the first
"-"      Subtract - subtract the second expr from the first
"+"      Add      - add two expressions together
"**"     Power    - take the first expr to the power of the second
\fP
.fi
.SH 
ARITHMETIC BIT-WISE OPERATORS
.LP
Valid bit-wise expressions may include the following standard C style
operators.  Note:  all expressions will be evaluated and then cast to
integers in order to do the arithmetic bit-wise operation.
.LP
.nf
\f(CW
"<<"     Shift Left      - shift the first expr to the left by second
">>"     Shift Right     - shift the first expr to the right by second
"&"      Bit wise AND    - and the two expressions together
"|"      Bit wise OR     - or the two expressions together
"^"      Bit wise XOR    - exclusive or two expressions together
"~"      Bit wise INVERT - invert the expression
\fP
.fi
.SH
ARITHMETIC ASSIGNMENT OPERATORS
.LP
Arithmetic assignment operators are ones in which the user updates the
current expression with a new expression.  The new and old expressions
are operated on by the type of assignment operator.   An example is the
"+=" operator which adds the new expression to the existing expression.
Valid assignment expressions may include the following standard C style
operators.
.LP
.nf
\f(CW
"*="     Multiply     -  multiply the current expr by the original expr
"/="     Divide       -  divide the current expr from the original expr
"-="     Subtract     -  subtract the current expr from the original expr
"+="     Add          -  add the current expr to the original expr

  (Note: both expressions will be evaluated and then cast to integers
	 in order to do the arithmetic bit-wise operation.)
"<<="    Shift Left   -  shift the first expression to the left by second
">>="    Shift Right  -  shift the first expression to the right by second
"&="     Bit wise AND -  and the current expr with the original expr
"|="     Bit wise OR  -  or the current expr with the original expr
"^="     Bit wise XOR -  exclusive or the current expr with the original expr
\fP
.fi
