-                Subtraction or Unary Minus                     MASM Operator

expression1 - expression2       (Subtraction)
or
- expression                    (Unary Minus)

Subtracts an expression from another, or makes an expression a
negative expression.

Notes:     The Subtraction operator's operands can be integers or
relocatable memory operands.  If both operands are
memory addresses, they both must reside in the same
segment.  The result of any subtraction operation is an
absolute value.

The Unary Minus has a higher precedence then the
Subtraction operator.  See 'Operator Precedence' for the
order of operator precedence.

See also: *
See also: +
See also: /
See also: MOD

- Subtraction or Unary Minus