9.16 Arithmetic negation operator

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      C-- lets you quickly specify arithmetic inversion of the sign of a

  memory variable or register, by putting '-' before and ';' after its

  identifier.

 

      A few examples:

 

           -AX; // same result as 'AX = -AX;' but quicker

           -tree; // same as 'tree = -tree;' but quicker

           -BH; // changes the sign of BH