Precedence               Operator Precedence

  --------------------------- Operator Precedence --------------------------
  Highest:    unary +    unary -
                not
                 *         /       div       mod        and      shl     shr
                 +         -       or        xor
  Lowest:        =        <>        <         >          <=       >=      in
  --------------------------------------------------------------------------

    Operators have an inherent precedence. In the absence of explicit
    grouping (through parentheses), an expression is evaluated according
    to the precedence of the operators involved. When operators have the
    same precedence, they are evaluated in left-to-right order.