static int calculateSum ( int n ) {
  if ( n % 2 == 1 ) return ( n + 1 ) / 2 ;
  return - n / 2 ;
}

static int calculateSum ( int n ) { if ( n % 2 == 1 ) return ( n + 1 ) / 2 ; return - n / 2 ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (return_statement (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (decimal_integer_literal)))) (return_statement (binary_expression left: (unary_expression operand: (identifier)) right: (decimal_integer_literal)))))