static int invertBits ( int n ) {
  int x = ( int ) ( Math . log ( n ) / Math . log ( 2 ) ) ;
  int m = 1 << x ;
  m = m | m - 1 ;
  n = n ^ m ;
  return n ;
}

static int invertBits ( int n ) { int x = ( int ) ( Math . log ( n ) / Math . log ( 2 ) ) ; int m = 1 << x ; m = m | m - 1 ; n = n ^ m ; return n ; }
(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: (cast_expression type: (integral_type) value: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal)))))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (decimal_integer_literal) right: (identifier)))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal))))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (identifier)))) (return_statement (identifier))))