static void alternateFib ( int n ) {
  if ( n < 0 ) return ;
  int f1 = 0 ;
  int f2 = 1 ;
  System . out . print ( f1 + " " ) ;
  for ( int i = 2 ;
  i <= n ;
  i ++ ) {
    int f3 = f2 + f1 ;
    if ( i % 2 == 0 ) System . out . print ( f3 + " " ) ;
    f1 = f2 ;
    f2 = f3 ;
  }
}

static void alternateFib ( int n ) { if ( n < 0 ) return ; int f1 = 0 ; int f2 = 1 ; System . out . print ( f1 + " ▁ " ) ; for ( int i = 2 ; i <= n ; i ++ ) { int f3 = f2 + f1 ; if ( i % 2 == 0 ) System . out . print ( f3 + " ▁ " ) ; f1 = f2 ; f2 = f3 ; } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (return_statement)) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (string_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 (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (identifier)))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (string_literal)))))) (expression_statement (assignment_expression left: (identifier) right: (identifier))) (expression_statement (assignment_expression left: (identifier) right: (identifier)))))))