- Subtraction or Unary Minus MASM Operatorexpression1-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.

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