%                Expression Operator                            MASM Operator

%text

Causes the assembler to treat text as an expression. MASM 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.

See also: &
See also: <>
See also: !
See also: ;;

% Expression Operator