static int sum_of_series ( int n ) {
  int result = 0 ;
  for ( int i = 1 ;
  i <= n ;
  i ++ ) {
    if ( i % 2 == 0 ) result = result - ( int ) Math . pow ( i , 2 ) ;
    else result = result + ( int ) Math . pow ( i , 2 ) ;
  }
  return result ;
}

static int sum_of_series ( int n ) { int result = 0 ; for ( int i = 1 ; i <= n ; i ++ ) { if ( i % 2 == 0 ) result = result - ( int ) Math . pow ( i , 2 ) ; else result = result + ( int ) Math . pow ( i , 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))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (cast_expression type: (integral_type) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (decimal_integer_literal))))))) alternative: (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (cast_expression type: (integral_type) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (decimal_integer_literal)))))))))) (return_statement (identifier))))