public static int countunsetbits ( int n ) {
  int count = 0 ;
  for ( int x = 1 ;
  x <= n ;
  x = x << 1 ) if ( ( x & n ) == 0 ) count ++ ;
  return count ;
}

public static int countunsetbits ( int n ) { int count = 0 ; for ( int x = 1 ; x <= n ; x = x << 1 ) if ( ( x & n ) == 0 ) count ++ ; return count ; }
(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: (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal))) body: (if_statement condition: (parenthesized_expression (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (decimal_integer_literal))) consequence: (expression_statement (update_expression (identifier))))) (return_statement (identifier))))