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 -                       Unary Negation Operator;  Binary Subtraction

 -exp1                   Unary Arithmetic negation
 exp1                    any real or integer expression

 exp1 - exp2             Binary subtraction
 exp1                    any real or integer expression
 exp2                    any real or integer expression

    The unary operator - performs arithmetic negation.  The result is the
    negative value of exp1; by definition, exp1 + -exp1 yields zero (0).

    As a binary operator, - performs subtraction.  The result depends
    upon the operands and follows the usual arithmetic conversion.  Note
    that subtraction is not commutative:  (A-B) ~= (B-A).  Examples:

           i = 3223 - 88;       /* i == 3135 */
           x = 3.5 - 4.5;       /* x == -1.0 */