+                        Unary Identity operator

 +exp1                   Unary Identity

    As a unary operator,  + does not affect  the value yielded by  exp1.

           i = +(a + b) + c;

-                        Unary Negation operator

 -exp1                   Unary Arithmetic negation
  exp1                   any expression

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