anchor.diff:  |
   
   | +-+
  -| substraction
  +| subtraction
   |
   
   | +*+
  
positive.code: ----
  <1> Note the usage of parentheses to surround an expression to apply the unary minus to that surrounded expression.
  
  In terms of unary arithmetics operators, the ++++ (increment) and +--+ (decrement) operators are available, 
  both in prefix and postfix notation:
  
  [source,groovy]
  
negative.code: 
  | +/+
  | division
  | Use +intdiv()+ for integer division, and see the section about <<core-syntax.adoc#integer_division,integer division>> for more information on the return type of the division.
  
  | +%+
  | modulo
  