static int invertBits ( int num ) {
  int x = log2 ( num ) + 1 ;
  for ( int i = 0 ;
  i < x ;
  i ++ ) num = ( num ^ ( 1 << i ) ) ;
  return num ;
}

static int invertBits ( int num ) { int x = log2 ( num ) + 1 ; for ( int i = 0 ; i < x ; i ++ ) num = ( num ^ ( 1 << i ) ) ; return num ; }
(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: (binary_expression left: (method_invocation name: (identifier) arguments: (argument_list (identifier))) right: (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: (expression_statement (assignment_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (decimal_integer_literal) right: (identifier)))))))) (return_statement (identifier))))