static int numberOfSolutions ( int n ) {
  int c = 0 ;
  while ( n > 0 ) {
    c += n % 2 ;
    n /= 2 ;
  }
  return ( int ) Math . pow ( 2 , c ) ;
}

static int numberOfSolutions ( int n ) { int c = 0 ; while ( n > 0 ) { c += n % 2 ; n /= 2 ; } return ( int ) Math . pow ( 2 , c ) ; }
(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))) (while_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) body: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal))))) (return_statement (cast_expression type: (integral_type) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal) (identifier)))))))