static int sum_of_series ( int n ) {
  int result = 0 ;
  if ( n % 2 == 0 ) {
    result = - ( n * ( n + 1 ) ) / 2 ;
  }
  else {
    result = ( n * ( n + 1 ) ) / 2 ;
  }
  return result ;
}

static int sum_of_series ( int n ) { int result = 0 ; if ( n % 2 == 0 ) { result = - ( n * ( n + 1 ) ) / 2 ; } else { result = ( n * ( n + 1 ) ) / 2 ; } return result ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (unary_expression operand: (parenthesized_expression (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal)))))) right: (decimal_integer_literal))))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))))) right: (decimal_integer_literal)))))) (return_statement (identifier))))